We renamed the GitHub repository from `zeit/now` to `vercel/vercel` so this PR updates all references to the repo URL.
There were also a few remaining references to Now CLI that have been updated to Vercel CLI.
This PR adds issue templates for common cases:
- Bug Report - to be submitted through the ZEIT Now support form.
- Feature Request - to be handled as a discussion between the community and ZEIT staff.
- Ask a Question - to be posted in Discussions for all to answer.
In addition to this, the PR also removes the Spectrum link from the README.
