Adds Learn about Premium Features to command palette

Adds links footer to home view when welcome is hidden
Polishes welcome/settings page headers
Removes links from welcome page
Removes old welcome view

Adds associated PRs to worktree branches
Adds worktrees to the settings page
Adds unpublished markers to worktrees

Disallows deletes of main worktrees & handles errors if attempted
Disallows skip confirmation of worktree create
Fixes issues with worktree folder location choosing and creation
Forces prompting for worktree location by default

Adds worktree open, create, & delete palette command

For upcoming premium features

Hides unsupported search options

Reworks revision uris to use a packed authority for better stability

Should hopefully no longer be required

Adds new visited paths trie for fast lookup of seen paths (to avoid git calls)
Replaces the tracked cache with a paths trie
All tries are case aware based on os and scheme (if uri based)

Adds new detectNestedRepositories setting to improve performance
Automatically handles nested repos for open document and remaps paths
Reworks isTracked for perf & nested repo detection

Changes excludes to a Set for faster matching
Splits getRepository into get & create (also removes async for get)
Replaces repo path methods with repo versions (part of moving away from string paths)
Renames getRemotes to getRemotesWithProviders & getRemotesCore to getRemotes

Adds unit testing (just for the trie for now)

Consolidates to node-fetch 2.6.7 as Octokit requires v2

Moves eslint ignores into rc file
 Removes unused dev dependency

Adds image minify webpack config for debugging

Reorganizes local git support to exclude from web
Swaps sha1 usages to md5 to avoid needing sha1 on the web (md5 is required by Gravatar)
Avoids crypto-browserfy and imports md5.js directly
Uses platform crypto for random nonce strings