[docs] Bash in Gitpod

[JesterOrNot]

Adds bash to languages_and_frameworks
Please see #383

[jankeromnes]

I took the liberty to clean up your commits and splice out any changes from other Pull Requests. 🙂 Easier to review now.

[jankeromnes]

Very nice, thanks a lot @JesterOrNot! 💯 I added a few comments below. Please take a look at them when you have time. 🙂

[jankeromnes]

Please rebase your Pull Request on top of the latest master changes.

It's actually pretty easy. Please do this:

1. Open this Pull Request in Gitpod by clicking https://gitpod.io/#https://github.com/gitpod-io/website/pull/385
2. In a Terminal, run git pull --rebase upstream master
3. If a conflict occurs, run git status to see which files need fixing (in red)
   a. For each conflicting file, open it in an Editor (e.g. Cmd + click on them)
   b. Find the conflicts (the texts between <<<< and ==== and >>>>)
   c. Decide what the final version should be (either by picking one option, or by removing the version you don't want and all the <<==>> characters)
   d. Save the file. Once it's clean, run git add path/to/file/you/just/fixed, and then git rebase --continue

At the end, it should say that the rebase was successful. 👍

EDIT: And when the rebase is successful (make sure it's finished by looking at git status!), simply run git push -f origin JesterOrNot/shell to update your Pull Request.