Replace external domain image links with local #test site

Fix the CSP blocks

test/site/content-org/all-posts.org

@@ -288,17 +288,17 @@ for testing.
 Below in Org source:
 #+begin_src org
 #+html: <style>.foo img { border:2px solid black; }</style>
-#+attr_html: :alt Go is fine though.
+#+attr_html: :alt Org mode logo
 #+attr_html: :width 300 :class foo
-[[file:https://golang.org/doc/gopher/pkg.png]]
+[[file:https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png]]
 #+end_src
 
 Rendered this:
 
 #+html: <style>.foo img { border:2px solid black; }</style>
-#+attr_html: :alt Go is fine though.
+#+attr_html: :alt Org mode logo
 #+attr_html: :width 300 :class foo
-[[file:https://golang.org/doc/gopher/pkg.png]]
+[[file:https:/ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png]]
 
 *NOTE*: We cannot use =:style= in =#+attr_html= because Hugo does not
  /yet/ support a =style= argument in the =figure= shortcode
@@ -1335,22 +1335,22 @@ should *not* be expanded.. they should be visible verbatim.
 - {&lbrace;% .. %}&rbrace; --- [[https://gohugo.io/content-management/shortcodes/#shortcodes-with-markdown][Shortcodes with Markdown]]
 **** Code block using code fences
 #+begin_src md
-{{< figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" >}}
-{{% figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" %}}
+{{< figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" >}}
+{{% figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" %}}
 #+end_src
 **** Code block using =highlight= shortcode
 Here, the =-n= switch is added to the Org source block to
 auto-enable[fn:4] using the =highlight= shortcode.
 #+begin_src md -n
-{{< figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" >}}
-{{% figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" %}}
+{{< figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" >}}
+{{% figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" %}}
 #+end_src
 *** Shortcodes *not* escaped
 The =figure= shortcodes in the below example block *should* be
 expanded.. you should be seeing little unicorns below.
 #+begin_example
-{{< figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" >}}
-{{% figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" %}}
+{{< figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" >}}
+{{% figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" %}}
 #+end_example
 Above a =#+begin_example= .. =#+end_example= block is chosen
 arbitrarily. The Hugo shortcodes will remain unescaped in *any*
@@ -2441,7 +2441,7 @@ automatically).
 {{{oxhugoissue(133)}}}
 
 #+attr_html: :width 10% :target _self
-[[https://orgmode.org/img/org-mode-unicorn-logo.png][https://orgmode.org/img/org-mode-unicorn-logo.png]]
+[[https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png][https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png]]
 
 Above is an hyperlinked image with the HTML attributes set as
 =#+attr_html: :width 10% :target _self= in Org.
@@ -2457,7 +2457,7 @@ Above is an hyperlinked image with the HTML attributes set as
 
 #+attr_html: :width 10% :target _self
 Here's an inline hyperlinked image with the exact same HTML
-attributes: [[https://orgmode.org/img/org-mode-unicorn-logo.png][https://orgmode.org/img/org-mode-unicorn-logo.png]]. So,
+attributes: [[https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png][https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png]]. So,
 clicking this image too should open the linked image in the same
 brower tab.
 ** External Links                                            :external_links:

test/site/content/posts/figure-shortcode-and-attr-html.md

@@ -124,16 +124,16 @@ Below in Org source:
 
 ```org
 #+html: <style>.foo img { border:2px solid black; }</style>
-#+attr_html: :alt Go is fine though.
+#+attr_html: :alt Org mode logo
 #+attr_html: :width 300 :class foo
-[[file:https://golang.org/doc/gopher/pkg.png]]
+[[file:https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png]]
 ```
 
 Rendered this:
 
 <style>.foo img { border:2px solid black; }</style>
 
-{{< figure src="https://golang.org/doc/gopher/pkg.png" alt="Go is fine though." class="foo" width="300" >}}
+{{< figure src="https:/ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" alt="Org mode logo" class="foo" width="300" >}}
 
 **NOTE**: We cannot use `:style` in `#+attr_html` because Hugo does not
  _yet_ support a `style` argument in the `figure` shortcode

test/site/content/posts/links-with-target-attribute.md

@@ -22,7 +22,7 @@ automatically).
 
 `ox-hugo` Issue #[133](https://github.com/kaushalmodi/ox-hugo/issues/133)
 
-{{< figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" width="10%" target="_self" link="https://orgmode.org/img/org-mode-unicorn-logo.png" >}}
+{{< figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" width="10%" target="_self" link="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" >}}
 
 Above is an hyperlinked image with the HTML attributes set as
 `#+attr_html: :width 10% :target _self` in Org.
@@ -37,6 +37,6 @@ Above is an hyperlinked image with the HTML attributes set as
 ---
 
 Here's an inline hyperlinked image with the exact same HTML
-attributes: <a href="https://orgmode.org/img/org-mode-unicorn-logo.png" target="_self"><img src="https://orgmode.org/img/org-mode-unicorn-logo.png" alt="org-mode-unicorn-logo.png" width="10%" /></a>. So,
+attributes: <a href="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" target="_self"><img src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" alt="org-mode-unicorn-logo.png" width="10%" /></a>. So,
 clicking this image too should open the linked image in the same
 brower tab.

test/site/content/posts/source-block-md-with-hugo-shortcodes.md

@@ -16,8 +16,8 @@ should **not** be expanded.. they should be visible verbatim.
 ### Code block using code fences {#code-block-using-code-fences}
 
 ```md
-{{</* figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" */>}}
-{{%/* figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" */%}}
+{{</* figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" */>}}
+{{%/* figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" */%}}
 ```
 
 
@@ -27,8 +27,8 @@ Here, the `-n` switch is added to the Org source block to
 auto-enable[^fn:1] using the `highlight` shortcode.
 
 {{< highlight md "linenos=table, linenostart=1" >}}
-{{</* figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" */>}}
-{{%/* figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" */%}}
+{{</* figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" */>}}
+{{%/* figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" */%}}
 {{< /highlight >}}
 
 
@@ -38,8 +38,8 @@ The `figure` shortcodes in the below example block **should** be
 expanded.. you should be seeing little unicorns below.
 
 ```text
-{{< figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" >}}
-{{% figure src="https://orgmode.org/img/org-mode-unicorn-logo.png" %}}
+{{< figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" >}}
+{{% figure src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png" %}}
 ```
 
 Above a `#+begin_example` .. `#+end_example` block is chosen