Pulsar Basics (refactoring content from Ch1 in atom archive)

[kaosine]

This is the update suggestions issue for suggesting updates for when the archived-docs(/docs/atom-archive) make their way to their new home as an accurate representation of ours(/docs/). Please use the suggestion feature in the comments on the code, or

All the respective content for this is under /docs/docs/atom-archive and will find a new home elsewhere in /docs/docs/. These are the sections I will need suggestions on:

• Getting Started (launch manual in the new docs)
  • Using Atom (Using pulsar)
  • Installing Atom (Installing Pulsar)
  • Hacking Atom (Core Hacking) (what's included here will be basic tips for customizing pulsara
  • FAQ
• Atom server-side APIs (I probably should drop this one unless we have a established bit for this, this I need confirmation on from @confused-Techie ) (this section is being reserved for later)

[kaosine]

Why pulsar is ready for edits. This PR will not address installing-pulsar.md. If anything, I will add a downloads page with links to get the most recent builds in another. This is just trying to get some resemblance of an updated getting started on the website. It needs some clarifications from @pulsar-edit/core in this section asap, so we can get moving on everything else and know where things stand on a lot of the things mentioned in here. Feel free to make suggestions when reviewing using that button, please ^_^

[Daeraxa]

@kaosine This subject really needed to get progressed, I've made a PR here (#148) which in some ways is not as extensive on the covered sections as this one but does include the other sections such as installation. Lots of the stuff here is still good (like the rework on the why-pulsar section) so maybe you could create a PR to my branch or create PRs if mine is merged?

The other changes like the FAQ/glossary etc. should really be covered in separate PRs.