Added new 'GitForge' param for non GitHub repos (#403)

* Added new 'GitForge' param for non-git repos

* Solved comments

Co-authored-by: Pablo Marcos <codebergflamingo@staplehorse.anonaddy.com>
Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

layouts/_default/single.html

@@ -70,8 +70,19 @@
 
         <!--- Improve this page button --->
         {{ if site.Params.GitRepo }}
+          {{ if site.Params.GitBranch }}
+            {{ .Scratch.Set "GitBranch" site.Params.GitBranch }}
+          {{ else }}
+            {{ .Scratch.Set "GitBranch" "main" }}
+          {{ end }}
           <div class="btn-improve-page">
-              <a href="{{ site.Params.GitRepo }}/edit/{{ site.Params.GitBranch }}/content/{{ .File.Path }}" title="{{ i18n "improve_this_page" }}" target="_blank" rel="noopener">
+            {{ if ( eq site.Params.GitForge "gitlab" ) }}
+              <a href="{{ site.Params.GitRepo }}/-/edit/{{ .Scratch.Get "GitBranch" }}/{{ .File.Path }}" title="{{ i18n "improve_this_page" }}" target="_blank" rel="noopener">
+            {{ else if ( eq site.Params.GitForge "gitea" ) }}
+              <a href="{{ site.Params.GitRepo }}/_edit/{{ .Scratch.Get "GitBranch" }}/content/{{ .File.Path }}" title="{{ i18n "improve_this_page" }}" target="_blank" rel="noopener">
+            {{ else }} <!--- Make Github-style the default -->
+               <a href="{{ site.Params.GitRepo }}/edit/{{ .Scratch.Get "GitBranch" }}/content/{{ .File.Path }}" title="{{ i18n "improve_this_page" }}" target="_blank" rel="noopener">
+            {{ end }}
                 <i class="fas fa-code-branch"></i>
                 {{ i18n "improve_this_page" }}
               </a>