Developer Guides: revise "Introduction to Fabric"

[its-miroma]

Update the develop/index.md page to drop mentions of obfuscation, mappings, Yarn (rip).

• [ ] add "Why Is Fabric Necessary to Mod Minecraft?" back?

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[cassiancc]

I see the description of this PR states that you want to restore the "Why Is Fabric Necessary to Mod Minecraft?" section, that should probably still be done before this is merged.

[its-miroma]

Yeah, but it only mentioned Yarn and the need for de-obfuscation. Perhaps it is no longer relevant

[cassiancc]

Probably fine without it then.