Reorganize languages in the examples section

[TC-MO]

Currently the order of languages in the right side examples section feels random

We should:

1. Prepare a comprehensive list of languages that we want to support there
2. Decide whether we want to remove some of them
3. Reorganize the order
4. Add syntax highlighting

[B4nan]

I guess we can close this one, the only missing piece is considering if we want to drop some of the languages.