Update wiki
Remove standalone module and make manager does not expose core module
wiki: rename example variable world -> refRegistry; tidy Ref.of and specs links Match the code: examples use 'refRegistry' (not 'world'); unbound refs shown as Ref.of(key, type, null) now the two-arg overload is gone; removed dead links to the no-longer-committed specs/. Legitimate domain examples (location.world, world_nether) left untouched.
Add complete EveryDatabase dev-guide wiki Home, sidebar, footer, and every section page — Getting Started, Core Concepts, Working with Data, Backends, the Manager module (per-context RefRegistry), Operations, Advanced, Reference, and Contributing. Conventions in specs/SPEC_wiki.md; content grounded in the repo sources and reviewed for accuracy against them.
Initial Home page