some routes can be improved

[priyansh32]

Currently there are two functions in src/controllers/organizations named index and instituteIndex

index fetched all organizations (I am not sure about the route of this function)

InstituteIndex

• fetches organizations belonging to a particular institute.
• Route: {{baseURL}}/institutes/:instituteId/organizations

We can use a single route to get required organizations using query params.

[Ashley936]

I couldn't find the route for index function anywhere. I don't think it's even needed.