refactor: doc view

[DanieliusDev]

Refactor the documentation view in /x/{module}?doc.

Here is the main things I would like changed:

1. We should be be able to have a search feature for the documentation of a module as some modules can have many exports which make it harder to find what we want.
2. The left sidebar should stay and only display the files and folders of a module so there can be a right sidebar which displays the exported items of the current file

[crowlKats]

For point 1 there is denoland/dotcom#885. For point 2: I am not in favour; this adds more visual clutter while making the main content of the page smaller, and doesnt allow for jumping directly to symbols from other files in the fileviewer. Respectfully closing