Add package repositories

Adding official package and container image search engines:

- Docker;
- NPM;
- Composer (Packagist);
- Go.

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

@@ -27,6 +27,10 @@ function web_search() {
     ask             "https://www.ask.com/web?q="
     youtube         "https://www.youtube.com/results?search_query="
     deepl           "https://www.deepl.com/translator#auto/auto/"
+    dockerhub       "https://hub.docker.com/search?q="
+    npmpkg          "https://www.npmjs.com/search?q="
+    packagist       "https://packagist.org/?query="
+    gopkg           "https://pkg.go.dev/search?m=package&q="
   )
 
   # check whether the search engine is supported
@@ -75,6 +79,10 @@ alias scholar='web_search scholar'
 alias ask='web_search ask'
 alias youtube='web_search youtube'
 alias deepl='web_search deepl'
+alias dockerhub='web_search dockerhub'
+alias npmpkg='web_search npmpkg'
+alias packagist='web_search packagist'
+alias gopkg='web_search gopkg'
 
 #add your own !bang searches here
 alias wiki='web_search duckduckgo \!w'