community: use a shortcode...

Only so-called "shortcodes" are supported as Hugo constructs in the
`content/` pages. I had forgottent that when I wrote 1deace4 (docs:
include more Git project-specific pages, 2025-03-01).

Thankfully, the `ci` build pointed it out (specifically, the link
checker step).

Normally, I would now squash the fix into the offending commit, but
there have been automated changes in the meantime (which took a bit over
a quarter hour to run) and in the interest of some convenience for
myself (and to be able to go relax instead of pouring more time into
this topic branch than I already have), and of keeping the original
commits as made by the automated workflow run, I will just leave this
fix on top of the automated changes.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

content/community/_index.html

@@ -101,7 +101,7 @@ <h2 id="git-rev-news"><a class="anchor" href="#git-rev-news"></a> Newsletter </h
   <h2 id="contributing"><a class="anchor" href="#contributing"></a> Contributing to Git </h2>
 
   <p>
-    The <a href="https://github.com/git/git/tree/master/Documentation">Documentation directory</a> in the Git source code has several files of interest to developers who are looking to help contribute. After reading the <a href="{{ relURL "docs/CodingGuidelines" }}">coding guidelines</a> and <a href="https://github.com/git/git/blob/master/CODE_OF_CONDUCT.md">code of conduct</a>, you can learn <a href="{{< relurl "docs/SubmittingPatches" >}}">how to submit patches</a>. If you are just starting out, you can read the <a href="{{< relurl "docs/MyFirstContribution" >}}">My First Contribution tutorial</a>. For those looking to get more deeply involved, there is a <a href="https://github.com/git/git/blob/master/Documentation/howto/maintain-git.txt">howto for Git maintainers</a>.
+    The <a href="https://github.com/git/git/tree/master/Documentation">Documentation directory</a> in the Git source code has several files of interest to developers who are looking to help contribute. After reading the <a href="{{< relurl "docs/CodingGuidelines" >}}">coding guidelines</a> and <a href="https://github.com/git/git/blob/master/CODE_OF_CONDUCT.md">code of conduct</a>, you can learn <a href="{{< relurl "docs/SubmittingPatches" >}}">how to submit patches</a>. If you are just starting out, you can read the <a href="{{< relurl "docs/MyFirstContribution" >}}">My First Contribution tutorial</a>. For those looking to get more deeply involved, there is a <a href="https://github.com/git/git/blob/master/Documentation/howto/maintain-git.txt">howto for Git maintainers</a>.
   </p>
 
   <p>