Bump to v.2.0.0

[papermana]

This PR will increment the major version but for now it's in beta.

Noteworthy changes (also, breaking):

• stuff from upstream as mentioned in Merge changes from upstream #22,
• updates to linters (Update dependencies added by Netguru fork #24, Satisfy eslint-config-airbnb's peer dependencies #25) — will break your app,
• when you import markdown files, you get their text (unparsed, though), not the reference to the file (Load markdown files as raw string #29, Load markdown files as raw string #34).
• SVG files named according to a pattern <name>.inline.svg are imported as React components rather than images (Handle SVGs as JSX. #38).
• Node.js constants can no longer be imported unless a flag is used (Disable loading constants module #39).