Use rendered docs URLs for release notes (#2117)

## Changes

<!-- List the changes this PR makes. -->

- This PR updates those URLs to the raw release notes so that they
appear well formatted, making them easier to read for contributors and
users.

### Files Changed

- `hugo.yml`
- `script/update-git-version.rb`
- `layouts/shortcodes/install-header.html`

Example before:
https://github.com/git/git/raw/HEAD/Documentation/RelNotes/2.52.0.adoc

Example after:

https://gitlab.com/git-scm/git/-/blob/v2.52.0/Documentation/RelNotes/2.52.0.adoc

## Context

The existing release notes URLs reference the raw AsciiDoc files on
raw.githubusercontent.com, which renders as plain text without
formatting. As a result, the release notes are harder to read.

This update replaces those raw URLs with links to the rendered AsciiDoc
view on the GitLab mirror, making the release notes more readable and
user-friendly. The links now reference the tagged version (v2.52.0) to
ensure they remain stable and accurately reflect the contents of the
2.52.0 release.

Author: dscho

hugo.yml

@@ -38,7 +38,7 @@ params:
   hugo_version: 0.148.2
   pagefind_version: 1.4.0
   latest_version: 2.52.0
-  latest_relnote_url: https://github.com/git/git/raw/HEAD/Documentation/RelNotes/2.52.0.adoc
+  latest_relnote_url: https://gitlab.com/git-scm/git/-/blob/HEAD/Documentation/RelNotes/2.52.0.adoc
   latest_release_date: '2025-11-17'
   windows_installer:
     installer_x64:

layouts/shortcodes/install-header.html

@@ -4,7 +4,7 @@
     <h1>Install</h1>
     <div class="version-badge">
       Latest version: {{ site.Params.latest_version }}
-      (<a href="https://github.com/git/git/blob/HEAD/Documentation/RelNotes/{{ site.Params.latest_version }}.adoc">Release Notes</a>)
+      (<a href="{{ site.Params.latest_relnote_url }}">Release Notes</a>)
     </div>
   </div>
 

script/update-git-version.rb

@@ -20,7 +20,7 @@
 config = YAML.load_file("hugo.yml")
 config["params"] = {} if config["params"].nil?
 config["params"]["latest_version"] = version
-config["params"]["latest_relnote_url"] = "https://github.com/git/git/raw/HEAD/Documentation/RelNotes/#{version}.adoc"
+config["params"]["latest_relnote_url"] = "https://gitlab.com/git-scm/git/-/blob/HEAD/Documentation/RelNotes/#{version}.adoc"
 config["params"]["latest_release_date"] = date.strftime("%Y-%m-%d")
 yaml = YAML.dump(config).gsub(/ *$/, "")
 File.write("hugo.yml", yaml)