Added new download links to index.md (#21510)
Added new download links to index.md (#21510)

* Changes in index.md

Added an IDE download link for Linux.

* Markdownize links + make them look better

raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp,BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp