docs: Add about Remote - SSH for remote dev.

[Riken-Shah]

This PR adds about Remote - SSH extension (in VS Code),
which helps us develop remotely by providing a
similar interface as if we are developing locally.

Testing plan:
Tested Localy

GIFs or screenshots:

[nikhilmaske-2001]

@Riken-Shah What if we show the tools (Remote-SSH and rmate) point wise just like we show Nano, vim, emacs, spacemacs and its description after it?
Something like:

• Remote - SSH : Remote - SSH allows us to inherit all the features of VS Code and provide a similar interface as if we are developing locally.

Before installing Remote - SSH, make sure that your remote machine meets the requirements.

You can easily set up Remote - SSH by following the steps here.

• rmate: To set up rmate for VS Code:

Install the extension Remote VSCode.
On your remote machine, run:
$ mkdir -p ~/bin
$ curl -Lo ~/bin/rmate https://raw.githubusercontent.com/textmate/rmate/master/bin/rmate
$ chmod a+x ~/bin/rmate
Make sure the remote server is running in VS Code (you can force-start through the Command Palette).
SSH to your remote machine using
$ ssh -R 52698:localhost:52698 user@example.org
On your remote machine, run
$ rmate [options] file
and the file should open up in VS Code. Any changes you make now will be saved remotely.

It will looks more straight forward and clear to read, the current doc may confuse the user as there is no seperation gap between both the tools description and it may lead the user to install both the tools simultaneously.

[Riken-Shah]

It'll look better. Thanks @nikhilmaske-2001!

[timabbott]

I made a few tweaks to simplify the changes (mainly avoiding repeating bits of third-party documentation on requirements/installation that is perfectly good), pushed back here, and merged. Thanks for working on this @Riken-Shah!

That said, it still looks pretty bad in the documentation because of the heading structure making the bulleted list and numbered list interact badly:

And I'm also left with the question of whether the rmate option (Which seems to also go with VSCode) is replaced by what we just documented and should be removed. Can you look into that?

[Riken-Shah]

I totally agree with you after using rmate for the last 3 months and Remote - SSH for the last 10 days, I can confirm that working with rmate was very tiring and time-consuming. Remote - SSH is a much better choice. But there might be one case we want to keep rmate - The slow internet connection! If the developer has a very slow internet connection then, using Remote - SSH is not a good idea because it makes multiple requests(continuously) to the server except the file change.

We can add a point in rmate that, it is only recommended for slow internet connection developers.
WDYT @timabbott?

[timabbott]

Yeah, I think adding some sort of recommendation commentary like that would be wise.

[Riken-Shah]

WDYT @timabbott?