Feature/13 Expand Admin Panel Capabilities - change board name and logo

[aPruner]

• Create an Admin Settings tab in the Admin Panel that lets admin users change the name and logo (via image URL) of their board.
• Pretty significant structural changes to frontend code, might need some extensive review
• Add a "settings" singleton model to the DB, which will also be used for more admin (or non-admin) settings in the future.
• Add backend api endpoints for fetching and updating the settings singleton (for board name and logo url)
• Add various TODOs for fixing issues in the project (for example, a key security vulnerability in the backend that I will create an issue for)
• Add some important startup information (about local mongodb) to the README.md
• Various spelling/grammar fixes

Please let me know what you guys think, and I apologize if this is too much stuff for one PR, but since the project is a POC anyway, hopefully it shouldn't be a big deal. Feel free to pull the branch and test out the feature locally.

[aPruner]

NOTE: There is a race condition I'm working on fixing real quickly in the Settings actions

edit: fixed

[PimDeWitte]

Code style looks solid, have not yet tested the functionality. Can we make an issue to fix the admin security issue?

[aPruner]

Yup, I'll create that issue right now

edit: done! #29

[PimDeWitte]

Looks good. One more change. Can you show ability to go to the admin panel on the home page if you are an admin?

[aPruner]

Oh yeah good call. Willdo!

[aPruner]

Added a link to the Admin Panel in the UserMenu @PimDeWitte