web-search: add Givero (supports good causes) as search engine (#7581)

Adds "givero" as a keyword for searching Givero, a relative new search engine donating revenue to good causes around the world.

plugins/web-search/README.md

@@ -37,6 +37,7 @@ Available search contexts are:
 | `ecosia`              | `https://www.ecosia.org/search?q=`       |
 | `goodreads`           | `https://www.goodreads.com/search?q=`    |
 | `qwant`               | `https://www.qwant.com/?q=`              |
+| `givero`              | `https://www.givero.com/search?q=`       |
 | `stackoverflow`       | `https://stackoverflow.com/search?q=`    |
 
 Also there are aliases for bang-searching DuckDuckGo:

plugins/web-search/web-search.plugin.zsh

@@ -17,6 +17,7 @@ function web_search() {
     ecosia      "https://www.ecosia.org/search?q="
     goodreads   "https://www.goodreads.com/search?q="
     qwant       "https://www.qwant.com/?q="
+    givero      "https://www.givero.com/search?q="
     stackoverflow  "https://stackoverflow.com/search?q="
   )
 
@@ -52,6 +53,7 @@ alias baidu='web_search baidu'
 alias ecosia='web_search ecosia'
 alias goodreads='web_search goodreads'
 alias qwant='web_search qwant'
+alias givero='web_search givero'
 alias stackoverflow='web_search stackoverflow'
 
 #add your own !bang searches here