Preventing Username and Educational Institue name overflow.

[MostlyKIGuess]

Fixes #4801

Describe the changes you have made in this PR -

It now prevents the user to write big names into username and educational institute fields.
Added a simple js code so that the user gets a warning like this:

and doesn't let him update unless it's under 200 and 400 characters for name and educational institute name respectively.

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

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[MostlyKIGuess]

@tanmoysrt Do review this sir.

[MostlyKIGuess]

@tanmoysrt should I make any other changes?

[tanmoysrt]

Hi @MostlyKIGuess
Thanks for raising the PR.

1. The issue is not yet approved and pending triage label hasn't removed
2. Contributors are assigned in first come basis. So, after verifying issue, if issue creator want to pass it to next, you will be assigned and you can raise the PR
3. We are moving from JQuery. So if you do any changes on frontend JS, do that in vanilla js instead of JQuery.