feat: Allow publishing libraries from UI

[ad1992]

• Backend support
• Support publishing of libraries
• Don't allow publishing of installed libraries unless edited
• Support multiple libraries deletion and publish
• Don't allow publishing same library twice
• Fix the layout shift when hovering
• Fix the layout shift when publish/delete buttons rendered
• local storage migration
• Remove //@ts-ignore
• Fix tests
• Support twitter handle and make github username optional
• Use github handle | twitter handle | first name when building the filepath for PR instead of github handle
• Add optional website field
• Use website | github url | twitter url for author's url field in libraries
• Check why fetch isn't working with form onSubmit so we can use html5 validation else set up validation for required fields

Good to have

• Improve png generation for multiple libs eg here
  Done: here
• Try showing username in the pr description, done here
• Make checkbox background opaque so its noticeable
• Add placeholders in publish dialog
• Show selected items preview in publish dialog
• Rename library to libraryItem in .excalidrawLib and add migration
• Don't close publish dialog on click outside
• Show selected library actions only when library item selected and use icons instead
• Add edit name functionality and error validation
• Add twitter/github urls in libraries.json when PR is created
• Save publish library data to local storage and clear once published
• Support export for selected library items and update export icon
• support removing items to be published (→ UI within the dialog)
• Replace window.confirm alerts for removal lib with confirm dialog

future

• we should have a bounding box of fixed width/height and resize the libs to that size so it fits inside the bounding box, so that png looks nicer
• persist publish dialog state to LS on reload (We persist when dialog closes right now, well, technically just persist on change, debounced, so it's futureproof)

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