Clean up README.md and CONTRIBUTING.md files

[lpatmo]

What type of PR is this? (check all applicable)

• [ ] 🐛 Bug Fix
• [ ] ✨ Feature (e.g. API change, enhancement, addition, etc.)
• [ ] ♻️ Refactor
• [x] 📝 Documentation
• [ ] 🔖 Release
• [ ] 🚩 Other (concerning: )

Context

Placeholder example below:

• [x] Updated README to follow the format in https://docs.google.com/document/d/1F7EJWK8HTTUGpw7g35I5Hs9nktaSLtd-BkCTWbVy07Y/edit
• [x] Moved all contributing instructions over to CONTRIBUTING.md
• [x] Added missing DigitalOcean logo (https://github.com/codebuddies/backend/issues/196)

Other Related Tickets & Documents (as needed)

88

New Libraries/Dependancies Introduced (Fill out as needed)

If you have added libraries or other dependancies, please list them (and links to their repos) below:

• [ ] I've updated requirements.txt

Any new migration files added?

• [ ] 👍 yes
• [x] 🙅 no, because they aren't needed

Did you add tests?

Code added or changed without test coverage or good reason for exemption won't be approved.

• [ ] 👍 yes
• [x] 🙋 no, because I need help
• [ ] 🙅 no, because they aren't needed

Did you add documentation?

• [x] 📜 readme.md
• [x] 📜 contributing.md
• [ ] 📜 wiki entry
• [ ] 🙋 I'd like someone to help write documentation, and will file a new issue for it
• [ ] 🙅 no documentation needed

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@fb77652). Click here to learn what that means. The diff coverage is n/a.

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  Hits            ?      467           
  Misses          ?      101           
  Partials        ?        0           

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