Add edit profile route & logic to backend

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Description

Please include a summary of the change and which issue is resolved. List any dependencies that are required for this change.

Added edit profile route. Allows for partial updates, so just send through the field(s) you want to change.

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Tested with Postman.

Checklist:

Please check [x] all that apply.

• [x] My code follows similar styling to existing code in this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, at the very least in hard-to-understand areas
• [x] I have made corresponding changes to documentation / READMEs
• [x] My changes generate no new warnings
• [ ] I have remade my frontend and backend Docker containers to ensure my changes do not break the setup for these
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [x] I have checked my code and corrected any misspellings