Add announcement bar about passGen v3.4 release

[josh-wong]

Description

This PR adds an announcement bar to the top of the site about passGen v3.4 release.

Related issues and/or PRs

• https://github.com/josh-wong/josh-wong.github.io/pull/92

Changes made

• Added an announcement bar to the Docusaurus configuration file.
• Removed a style that applied padding in the announcement bar in the custom CSS file.

Checklist

The following is a best-effort checklist. If any items in this checklist aren't applicable to this PR, add N/A after each item.

Documentation

• [x] I have updated the side navigation as necessary. N/A
• [x] I have updated the documentation to reflect the changes. N/A
• [x] I have documented or updated any remaining open issues linked to this PR in GitHub, Obsidian, etc. N/A

Build, deploy, and test

• [x] I have merged and published any dependent changes in other PRs.
• [x] I have commented my code, particularly in hard-to-understand areas. N/A
• [x] I have checked that my changes look as expected on a locally built version of the docs site.
• [x] My changes generate no new warnings.

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