gsoc26: Add MIT organization's profile and fix summary link

[gluonparticle]

As I read and went through all the projects, I noticed MIT's appearance in 2 of the projects. But the web page leading
to mit.html was inaccessible due to the missing file.

This PR fixes simply fixes the issue by adding mit.md and MIT's logo according to the 2026 rules.

Functional preview of the edits:- https://hsf-github-mo0tux34f-sarguns-projects-3259a370.vercel.app/activities/gsoc.html ;

Thank you ;

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[gluonparticle]

Things which might need edits:-

1. Author name : - I have mentioned @kjvbrt . But I'm unsure about the right name to write from 2 of the MIT's
   projects which have been added by separate mentors to the repository (Considering they're the authors of the
   project). Or is it meaningful to write my name (author of this file)?

2. The MIT's description ;