Add Prettier as a formatter (and format everything)

[FireIsGood]

Fixes #526

Adds prettier and formats everything applicable. There are also some assorted format fixes manually added as part of checking every single page.

Every post has been manually looked through for errors and corrected.

Before

One of many, many examples:

command | description
:-| :-
`curl -I https://cheatsheets.zip` | `curl` sends a request
`curl -v -I https://cheatsheets.zip` | `curl` request with details
`curl -X GET https://cheatsheets.zip` | use explicit http method for `curl`
`curl --noproxy 127.0.0.1 http://www.stackoverflow.com` | `curl` without http proxy
`curl --connect-timeout 10 -I -k https://cheatsheets.zip` | `curl` has no timeout by default
`curl --verbose --header "Host: www.mytest.com:8182" cheatsheets.zip` | `curl` get extra header
`curl -k -v https://www.google.com` | `curl` get response with headers
<!--rehype:class=auto-wrap-->

After

After formatting

| command                                                               | description                         |
| :-------------------------------------------------------------------- | :---------------------------------- |
| `curl -I https://cheatsheets.zip`                                     | `curl` sends a request              |
| `curl -v -I https://cheatsheets.zip`                                  | `curl` request with details         |
| `curl -X GET https://cheatsheets.zip`                                 | use explicit http method for `curl` |
| `curl --noproxy 127.0.0.1 http://www.stackoverflow.com`               | `curl` without http proxy           |
| `curl --connect-timeout 10 -I -k https://cheatsheets.zip`             | `curl` has no timeout by default    |
| `curl --verbose --header "Host: www.mytest.com:8182" cheatsheets.zip` | `curl` get extra header             |
| `curl -k -v https://www.google.com`                                   | `curl` get response with headers    |

(I had to manually fix a lot of tables)

Some files like minimized CSS and the fuze.js file have been ignored.

[Fechin]

@FireIsGood, Thank you very much for your extensive and for taking the initiative to add prettier and format our project! It's impressive to see the diligence with which you've manually reviewed each file and fixed errors.