Rework commit info display in footer (#277)

* Rework commit info display in footer

Use Hugo .GitInfo to get Hash and AbbreviatedHash
Remove leading · because it renders as .· when credits are displayed

* Update CONTRIBUTORS.md

CONTRIBUTORS.md

@@ -60,3 +60,4 @@
 - [Paolo Mainardi](https://paolomainardi.com)
 - [Ka-Wai Lin](https://github.com/kwlin)
 - [Piotr Orzechowski](https://orzechowski.tech)
+- [Glenn Feunteun](https://github.com/gfeun)

layouts/partials/footer.html

@@ -16,8 +16,9 @@
       {{ i18n "powered_by" }} <a href="https://gohugo.io/">Hugo</a> & <a href="https://github.com/luizdepra/hugo-coder/">Coder</a>.
     {{ end }}
     {{ if .Site.Params.commit }}
-      {{ if or (not .Site.Params.hideCredits) (not .Site.Params.hideCopyright) }} · {{ end }}
-      [<a href="{{ .Site.Params.commit }}{{ getenv "GIT_COMMIT_SHA" }}">{{ getenv "GIT_COMMIT_SHA_SHORT" }}</a>]
+      {{ if .GitInfo }}
+        [<a href="{{ .Site.Params.commit }}/{{ .GitInfo.Hash }}">{{ .GitInfo.AbbreviatedHash }}</a>]
+      {{ end }}
     {{ end }}
   </section>
 </footer>