Add simple CI usage documentation

[TobiasCGoetz]

Hi,

I added some basic documentation for using KubeLinter as part of a CI pipeline. While there is a Github Action available, I might not be the only one interested in running it elsewhere. I found the --fail-on-invalid-resource option especially important when dealing with manual changes to YAML files.

#965

[sourcery-ai]

Hey @TobiasCGoetz - I've reviewed your changes - here's some feedback:

• The JSON parsing snippet with grep/awk is brittle; consider using jq or the GitHub CLI to reliably fetch the latest release URL.
• The relative link README.md##kubelinter-github-action may not render correctly—update it to a valid Markdown anchor or full URL for the GitHub Action.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- The JSON parsing snippet with grep/awk is brittle; consider using `jq` or the GitHub CLI to reliably fetch the latest release URL.
- The relative link `README.md##kubelinter-github-action` may not render correctly—update it to a valid Markdown anchor or full URL for the GitHub Action.

## Individual Comments

### Comment 1
<location> `docs/using-kubelinter.md:65` </location>
<code_context>

+## Using KubeLinter as part of your CI pipeline
+
+If you're using Github, there's the [KubeLinter Github Action](README.md##kubelinter-github-action) available.
+
+Alternatively, you can grab the latest binary release with the following commands
</code_context>

<issue_to_address>
Correct 'Github' to 'GitHub' for proper branding.

Update all instances to 'GitHub' for consistency.
</issue_to_address>

<suggested_fix>
<<<<<<< SEARCH
If you're using Github, there's the [KubeLinter Github Action](README.md##kubelinter-github-action) available.
=======
If you're using GitHub, there's the [KubeLinter GitHub Action](README.md##kubelinter-github-action) available.
>>>>>>> REPLACE

</suggested_fix>

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.66%. Comparing base (dbd7529) to head (47a5f8b).
Report is 140 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #970       +/-   ##
===========================================
- Coverage   62.36%   28.66%   -33.70%     
===========================================
  Files         197      209       +12     
  Lines        4854     5947     +1093     
===========================================
- Hits         3027     1705     -1322     
- Misses       1439     4126     +2687     
+ Partials      388      116      -272     

Flag	Coverage Δ
unit	28.66% <ø> (-33.70%)	⬇️

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