UI update

[AlexFreik]

Important: there are so many additions and deletions because I autoformated the files in this commit: 5f350f3
Before formating it was a big mess of html, and there were a few missed tags, or wrong tags, which I fixed in: 23caff6

From original files only the html/settings.html file was changed functionally. All other html files were just autoformated, and I didn't touch them after this.

I dockerized the project, so anyone can run the whole thing with just one command $ docker compose up. Right now it is used only for development, and the old way of running with install-nginx.sh works the same.

Here are UI changes inhtml/settings.html file:

1. Basic styling, so that it is not black & white.
2. When user adds new destination, the server response appears in the bottom right corner in a queue like manner instead of oppening a new tab:
   
3. All streams can have nicknames, so it is easier to add new destinations (they will only appear on the UI, and do not interfeer with backend):
   
   One can set the names in the table at the bottom of settings page:
   
4. Dropdown with Server URL default values, so it is faster to add YouTube or Facebook streams: