Update Personal Branding lesson (personalbranding.md) for current state of Social Media

[MaggieFero]

Page where problem found?

https://github.com/Techtonica/curriculum/blob/main/personal-brand/personal-branding.md

Type of problem

Outdated content

Suggested Solution

This content should be updated to reflect the current state of social media, including that Twitter interactions have declined in both quality and quantity, Block Party works significantly differently now, and new tools including Mastodon, BlueSky, and Threads have been launched