docs: mention the side-bar

[Lewiscowles1986]

Description

Adds some blurb to the main installation page, as it is the default navigated page from the docs if I click installation.

Motivation and Context

I Cannot be the only person that thought "why is there a blank installation page". The other pages are really good too!

I'm totally cool if this cannot be merged, but I was really expecting cargo install or install binaries to be on this page, so it caused a momentary disconnect that I had to look for where to find the information, instead of it being right there for me.

A list of links might be nice, but; for-now, this would at least allow continuous flow.

How Has This Been Tested?

I just wrote text in a docs page.

Screenshots / Logs (if applicable)

Just what the page looks like for me when I visited.

Types of Changes

• Documentation (no code change)

Checklist:

• I have updated the documentation accordingly.

[welcome]

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[Lewiscowles1986]

While I could change https://github.com/orhun/git-cliff/actions/runs/16552784738/job/46810035103; I don't think it really belongs in this patch set.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.59%. Comparing base (8b5a547) to head (020096f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1226   +/-   ##
=======================================
  Coverage   41.59%   41.59%           
=======================================
  Files          22       22           
  Lines        1919     1919           
=======================================
  Hits          798      798           
  Misses       1121     1121           

Flag	Coverage Δ
unit-tests	41.59% <ø> (ø)

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