Plundering the SpongeCommon Wiki about spongedocs

[simon816]

Definitely worth at least linking it somewhere under the "Developing Sponge" section - https://docs.spongepowered.org/stable/en/contributing/implementation/index.html.

Possibly it could be moved there so we have one place for all documentation?

[Inscrutable]

So far, the content worth purloining be held in the "Implementation Policy: Bridges and Mixins" section, that may be acceptable as a new SpongeDocs page. ⚓️ Avast there, cap'n @gabizou - what is the state of affairs, and would ye be minding if we offloads yer precious Wiki cargo onto our fine vessel? ☠️