Projects beta parity with projects classic (milestone 1)

[github-product-roadmap]

Summary

In order to help teams migrate over from projects classic, we have a number of areas where we are working towards feature parity. In progress for this quarter are:

• Ability to add outside collaborators
• Project descriptions
• Index page search filters

[ankneis]

🚢 shipped: https://github.blog/changelog/2022-02-02-the-new-github-issues-02-02-update/