* Fix Links to Changelog/Readme/Commits for `multisrc`
working basic fix. Needs to be refactored into `createUrl()`
* Refactor back into `createUrl`
hopefully the logic is understandable
there's three cases:
- when multisrc, if `path` isn't mentioned, then we're trying to open
commmit history
- when multisrc, if `path` is mentioned, then its either a changelog or
a readme to a multisrc extension, the files are stored in the
`overrides` subfolder
- when not multisrc, we're looking at a single source where the links
are constructed in the same way regardless of it being
changelog/readme/commit history
(cherry picked from commit e7695aef78c92c10e5bae953b24a19e67ac156af)
f461c71625