* basic about screen
* work
* finish implementing about plugin except theme spec
* show about plugin only on first version run
* some cleanups and do the right thing with open/xdg-open
* refactor: make ui framework
* refactor: remove old stuff
* refactor: about plugin
* style(fmt): rustfmt
* chore(repo): about plugin asset
* fix tests
* style(fmt): rustfmt!!
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