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docs: fix broken links and tidy README/CONTRIBUTING

- README: switch community badge from Slack to Discord (aka.ms/playwright/discord)
- README: fix outdated .NET repo link (playwright-sharp -> playwright-dotnet)
- README: grammar ("multiple pages") and drop stray blank line in Go example
- CONTRIBUTING: fix missing space before `git reset`, clarify Roll steps
  (note apply-patch.sh auto-commits, use `&&` instead of `;`)