For upcoming premium features

Consolidates to node-fetch 2.6.7 as Octokit requires v2

Avoids re-export from git provider service

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

This is to ultimately will support virtual repositories (without git)