fix(db): use full names for subject name and college name

[Keshav-writes-code]

Motivator

College Name

in the future i am only going to get the full name of the college, and some college names could be obscure and not ideal for making a short name out off. so its better to use a full name

• if going with this decision:
  • make sure to use the college full name in place of college short name in the candiate key. exclude college short name from candidate key.
  • make sure to use college full in the url and replace " " spaces with "_" underscores

Subject Name

there is a bit of possiblity that 2 subject might have the same short name. so thier PYQ's might get merged in a single hierarchy.
Also there might me Subject which might not even be able to shortned like Maths. so..

• if going with this decision
  • make sure to use the subject full in the url and replace " " spaces with "_" underscores