Clarify locations for getting started in README (tgstation#87739)

## About The Pull Request
This is a `README.md` update to more efficiently point potential
contributors to the appropriate documentation for configuring their dev
environment.

## Why It's Good For The Game

It is typically best practice to make it easy for developers to quickly
contribute a change to a project by making things as clear as possible.

README.md

@@ -39,12 +39,15 @@ Space Station 13 is a paranoia-laden round-based roleplaying game set against th
 
 **[How to compile in VSCode and other build options](tools/build/README.md).**
 
-## Contributors
-[Guides for Contributors](.github/CONTRIBUTING.md)
+## Getting started
 
-[/tg/station HACKMD account](https://hackmd.io/@tgstation) - Design documentation here
+For contribution guidelines refer to the [Guides for Contributors](.github/CONTRIBUTING.md).
 
-[Interested in some starting lore?](https://github.com/tgstation/common_core)
+For getting started (dev env, compilation) see the HackMD document [here](https://hackmd.io/@tgstation/HJ8OdjNBc#tgstation-Development-Guide).
+
+For overall design documentation see [HackMD](https://hackmd.io/@tgstation).
+
+For lore, [see Common Core](https://github.com/tgstation/common_core).
 
 ## LICENSE