[Documentation:Developer] Overhauled the Getting Started page

[JManion32]

Updated the Getting Started page by:

• removing bloat
• moving things around
• dividing the page up with more headers

Specific changes include:

• Listing languages/frameworks and providing links to each of their pages
• Listing dev infrastructure and adding links where applicable
• Divided the page into 3 headers: Setting Up, Making Contributions, Helpful Links
• Added a bullet for VS Code users to help them better navigate the project
• Added a section about Dev Tools and how each tab can be used when debugging
• Removed jsfiddle bullet, and bullet about keeping a diary (not necessary in my opinion)

If anyone has suggestions for how we can further improve this page, I'm all ears!

[JManion32]

@bmcutler Here is a revised version of the Suggestions for New Developers page we talked about today. Please let me know if there is anything else I should add/delete/revise.