Fix: Options & popup showing white screen when restarting browser

Migrate storing links data from the extension local storage to IndexedDB using a Dixie.js (a light wrapper on top of IndexedDB), and also other several features/improvements.

• Using IndexdDB through Dixie.js library makes more sense for storing links, which are dynamic structured data that is generated by the user, and it can also store blob data, so relying on base64 the images in Linkinary can be fully dropped, because blob urls can be generated directly after retrieving links from database.
• Implement image popover on hover for favicons and snapshots in the options page. Snapshots are only available for website links.
• Links for collapsed sections and the captured snapshot for a link are only fetched when user do the proper interaction.
• All the links now have some default favicon, and the blob url for each type of favicon is only generated once since it can be used by multiple links.

Changelog:

• Small UI improvements
• Define storage entry for last visited link per sections and another entry for snapshots
• Create a page action that only shows in the url bar when you open links that are stored by Linkinary
• Create a context menu that shows when you right click on a anchor element and allow you to add the link to linkinary or remove it