mbsync: update configuration

* Change Master/Slave to Far/Near
* Combine IMAPStore and IMAPAccount blocks

Also rename mail folder from gpanders.com to 'personal'.

mbsync: change mail folder

Don't sync gmail locally

Manage dotfiles directly in home directory

Revert back to SyncState * for mbsync

Save mbsync state in separate directory

Don't flatten email hierarchy in mbsync

Flatten hierarchy in mutt folders

Add gmail to isync

Update mutt config to use local gmail instead of directly via IMAP

Replace OfflineIMAP with mbsync