Add git integration to server

Adds git integration as in #71.

Let me know if I should squash all relevant commits into a single one.

The branch also contains some early commits of minor fixes I picked up along the way in my first few days exploring the codebase. Let me know if I should move them to a separate MR or remove them altogether.

added 5 commits

• abe9bb14...10c9a5a4 - 5 commits from branch scipost:master

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added 15 commits

• 0885c6f9 - add .venv, configs and sensitives to gitignore
• 0c8a9453 - add missing imports breaking populate_faker_data
• b77ab20f - update psycopg2 for python3.11
• ef4fc3d3 - add vet_superusers command
• e2a76bc2 - remove absolute urls from refereeing
• 2ed1699d - add proofs repo object and tests
• 9afd8ab0 - add basic gitlab integration with main server
• 2e7b6454 - add proceedings handling and tests to proofs repo
• 023f29c9 - add copying of pure templates to empty repos
• 34b2be69 - add template formatting to git repo
• 3c2fbbbf - add signal to advance repos on creation
• 573fe35e - add author files to repo from arxiv
• 5e7366a4 - add try catch to git repo creation
• a27e9df5 - add git url and clone url to proof repo model
• 680e21a8 - change git repo creation running to hourly cronjob

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added 10 commits

• 1a4a5075 - add proofs repo object and tests
• 1c3fd550 - add basic gitlab integration with main server
• 9f7f3f0f - add proceedings handling and tests to proofs repo
• 7af05f4e - add copying of pure templates to empty repos
• 8fcc038b - add template formatting to git repo
• edbeb4c4 - add signal to advance repos on creation
• 071f6671 - add author files to repo from arxiv
• be5122f3 - add try catch to git repo creation
• 0d3db738 - add git url and clone url to proof repo model
• a0043ae6 - change git repo creation running to hourly cronjob

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added 1 commit

• 74254455 - move proofs repo constants inside model

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mentioned in commit 86dc65bc

merged