docs: fix markdown formatting in the docs

[okineadev]

Overview

Fixed Markdownlint violations, simplified formatting, minimized HTML usage, and improved readability

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[aklinker1]

See https://github.com/wxt-dev/wxt/pull/1386#pullrequestreview-2588403176. We can add markdownlint to the project and update all the files at the same time.

[aklinker1]

Replaced by https://github.com/wxt-dev/wxt/pull/1711

[okineadev]

Replaced by #1711

I understand you, but please next time if I did something, but if you decide to replace my PR with a new one (using my changes) - then add me as a Co-Author:

Co-authored-by: Okinea Dev <[email protected]>