Changes:
- Updated the "Test Fleet website" and "Deploy Fleet website" workflows
to include the full git history when checking out the repo.
- Updated the website's build-static-content script to use git to build
lastModifiedAt timestamps for Markdown and YAML files on the website.
- Updated the article template page and article category pages to show a
timestamp of when an article's Markdown file was last changed, if it was
updated >3 days after it was published.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Articles now conditionally display an **Updated** timestamp when they
were substantially modified after publication.
* The **Updated** indicator is shown on both article listing pages and
individual article pages (including mobile/desktop headers).
* **Bug Fixes**
* Timestamp rendering is now more consistent, helping readers
distinguish original publish dates from later edits.
* **Styling**
* Added styling to support the new “updated timestamp” label and
timestamp formatting within article cards.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Eric
5cefa9d5bb