Move pre-commit.sh under dev/

* pre-commit.sh: Rename...
* dev/pre-commit.sh: ...to this.
* readme-template.md (Contribute):
* dash-template.texi (Contribute): Adapt accordingly.
* README.md:
* dash.texi: Regenerate docs.

README.md

@@ -3005,7 +3005,7 @@ Regenerate the docs with:
 I highly recommend that you install these as a pre-commit hook, so
 that the tests are always running and the docs are always in sync:
 
-    cp pre-commit.sh .git/hooks/pre-commit
+    cp dev/pre-commit.sh .git/hooks/pre-commit
 
 Oh, and don't edit `README.md` or `dash.texi` directly; they are
 auto-generated.  Change `readme-template.md` or `dash-template.texi`

dash-template.texi

@@ -238,7 +238,7 @@ commands as a Git pre-commit hook, so that the tests are always
 running and the docs are always in sync:
 
 @example
-$ cp pre-commit.sh .git/hooks/pre-commit
+$ cp dev/pre-commit.sh .git/hooks/pre-commit
 @end example
 
 Oh, and don't edit @file{README.md} or @file{dash.texi} directly, as

dash.texi

@@ -4605,7 +4605,7 @@ commands as a Git pre-commit hook, so that the tests are always
 running and the docs are always in sync:
 
 @example
-$ cp pre-commit.sh .git/hooks/pre-commit
+$ cp dev/pre-commit.sh .git/hooks/pre-commit
 @end example
 
 Oh, and don't edit @file{README.md} or @file{dash.texi} directly, as

readme-template.md

@@ -128,7 +128,7 @@ Regenerate the docs with:
 I highly recommend that you install these as a pre-commit hook, so
 that the tests are always running and the docs are always in sync:
 
-    cp pre-commit.sh .git/hooks/pre-commit
+    cp dev/pre-commit.sh .git/hooks/pre-commit
 
 Oh, and don't edit `README.md` or `dash.texi` directly; they are
 auto-generated.  Change `readme-template.md` or `dash-template.texi`