Add support for puzzle content and solution file uploads#20

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obijywk wants to merge 5 commits intogalacticpuzzlehunt:masterfrom obijywk:puzzlecontentuploads

+305-48

Commits on Jun 18, 2021

Relax pre-commit language_version for ambv/black for python3.8 compatibility
obijywk
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Commits on Jun 19, 2021

Add support for puzzle content and solution file uploads
obijywk
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Commits on Jul 2, 2021

Commits on Aug 6, 2021

Add uploaded puzzle content link to testsolving page
obijywk
committed