Initial stable release

This the first stable release. Notable changes include:

• The default branch is now main. For backward compatibility master branch will only exist for a short period of time. You're highly advised to update your links and local repository. Follow the steps from here.
• A total of 209 unique communities, thanks to all the contributors.
• Contribution guide and ToC are more simplified.
• Template generator script properly verifies invite link, thanks to @MattIPv4.