serve all in-crate js files #329
                
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Starting with rust-lang/rust#59776, the search index, aliases, and source file list are getting the resource suffix added to their file names. This means we can't route them from a static path any more.
Since we always check the static file router first, this will still allow serving
main.jsfor rustdoc versions prior to the addition of--static-root-path, and also allows rustdoc to add per-crate javascript files without requiring docs.rs to update to handle it.(It also allows us to start hosting things other than rustdoc output as docs - e.g. mdbook output - in the future without changing the routing table massively.)
WARNING: Do not merge/deploy until rust-lang/rust#59776 is in nightly rustdoc. Deploy with
update-both-rustc-docsrsscript to ensure that docs.rs doesn't use the wrong rustdoc to build/serve docs!