* (feature): add custom font styling for org-roam links
This adds 'org-roam-link-face. When org-roam-mode is on, all roam
links take this face. By default, it is exactly the same as 'org-link,
and would require styling.
* update docs
This allows for more flexible naming of files. Now filename defaults
to yyyymmddhhmmss_title_here.org. Also, remove
`org-use-timestamp-as-filename`, and change it to
`org-roam-filename-noconfirm` to better describe what it is doing.s
