Add autocompletion for course name, course code and professor names

Course names and course codes can be canonicalised by using a autocompletion dropdown. (See [courses.json](https://github.com/metakgp/iqps-go/blob/main/frontend/src/data/courses.json)).

Similarly, we can store a list of names of professors, and autocomplete it.

Also, there should be restrictions on possible course codes (e.g. number of characters, first 2 characters must be alphabetical, etc.)

Start by reading frontend/src/data/courses.json and locating the form entry points for course names, course codes, and professor names. Define the available professor-name data and the course-code rules from the issue, then verify that each field offers canonical suggestions and rejects invalid course codes.

Written by the indexing model from the issue text.