OAuth (#22)
* add metadata
* test pages action
* initial oauth flow
* update scope
* login in settings
* remove session from plugin class
* remove oauth modal
* add session store / refactor
handle missing block text
* render before done fetching feed
* initila work for redirect to obsidian uri scheme
* switch back to browser client
* cleanup storing session/agent
* cleanup
* better html page
* better settings layout
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