Fixed regex issues again, added cancel button and able to interact with the course blocks

[Vaten0x]

Overview:

• Fixed bugs with adding courses that start at 8:00 a.m.

• Now you can even add courses that have no location specified on the Workday

• Code is cleaned up and the build folder is in .gitignore

• Updated README for better visual

• Added a cancel button:

  • Use it to cancel highlighting courses that you clicked "add" [+] button
  • It can also be used to press after seeing a conflict within your schedule. (You won't be able to add your highlighted course when it's in conflict)

• Now you can remove or look at more details by clicking on the