#3381 README: Fix broken links and reorder sections Pull request opened by davidmirror-ops Tracking issue Closes #3377 Describe your changes • Added a Quickstart section • Reordered and expanded Contributing-related information • Updated communication channels • Takes inspiration from awesome-readme Check all the applicable boxes ☑︎ I updated the documentation accordingly. ☑︎ All new and existing tests passed. ☑︎ All commits are signed-off. Screenshots Note to reviewers flyteorg/flyte ✅ All checks have passed 6/6 successful checks