Update to reflect current community structure

[hannesfrank]

• Agree with removing the Github issue tracker and the v0 plugin docs.
• Technically these longer explanations diverge from the intention of an awesome list. I can see these explanations being useful as orientation for new users, but I really want to keep the list as compact as possible to be skimmable for all users. Intermediate users may use it as reference repeatedly where more text makes stuff harder to find?
  • An option to provide additional details in markdown is <details>, e.g.

Link to Youtube

Youtube is a place to share videos. You find awesome tutorials about nearly everything there.

<details>
  <summary>Link to <a href="https://youtube.com">Youtube</a></summary>
  <!-- Looks like markdown does not work in <summary> so HTML links are needed there. -->

  Youtube is a place to share videos. You find awesome tutorials about nearly everything there.
</details>

• Did you remove Youtube intentionally? I think it should stay in the "RemNote ecosystem" link list.

[WildGenius]

Unfortunately, the current amount of platforms and their differing purposes demand verbose explanation. Then again, I am a verbose writer, so feel free to edit as necessary. As for YouTube tutorials, as far as I know, the only up-to-date RemNote video content is the Official Tutorial Series, which is linked in tutorials. If there will be more from other people, it's worth linking, otherwise I fear people getting mislead by months-old videos.