Add ability to highlight newly released features in a webview

[pokey]

The problem

There is currently no way for a user to know when we release new features in cursorless. We'd like some way to highlight new features for users.

The solution

We'd like to display release notes in a webview when we release new features. We don't want to do so on every release, especially once we move to continuous delivery (#17), but we should have some mechanism to highlight new features when we want to. We could do something roughly as follows

• Have a directory of markdown files, one per each feature that we want to highlight
• Keep track of which feature highlights the user has seen using global storage, making sure to sync across instances
• Stitch together the highlights they haven't seen and show them in a webview on extension update
• Figure out a way to include these feature highlight snippets in the docs?
• Can use these to link to video showing how to use the feature
• Do this monthly?
• Also publish this to the website
• Do this automatically from PRs using some automated system? Maybe https://github.com/uptech/git-cl

update

• Have release notes just in docs site
• Show a toast in vscode that links to page
• Each release has its own file eg 0.27.0.md. Can have frontmatter with release date for future use
• When extension starts, look for version key. If it does exist, check if it's less than current version. If it is, show a toast linking to current version. Then set the key to current version either way
  • Make sure that the key is synced so it doesn't show on their other computers
• Show sponsor link
• In the future we can automatically generate release notes from smaller markdown files that each PR contributes with the feature it introduces, including frontmatter about how major it is, date, etc
• Make sure release notes unroll when linked in slack
• post them to slack when I release them

Resources

• The tailscale release notes are nice