Draft: Implement a basic REST API and React frontend for the voter UI

Alternative UI frontend for the voter UI with a REST API.

TODO:

• Fully test if we have feature parity with the current voter frontend
• Implement spectator links
• Implement application image upload

added 1 commit

• f5045402 - fix development setup with corsheaders and pylint

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added 33 commits

• f5045402...c1a0631e - 30 commits from branch master
• 3ee4ee87 - Merge branch 'master' into feature/rest-api
• c8a5bfda - Merge remote-tracking branch 'origin/master' into feature/rest-api
• 00df14d4 - help pages in react app, packaging of react app

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changed the description

added 1 commit

• 72a8dbcd - clean up and prepare for management frontend

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added 1 commit

• 7f503cb0 - react: add spectator view

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marked the checklist item Implement spectator links as completed