Update libraries.md

Fixing docs that became out of date following https://github.com/BladeRunnerJS/brjs/issues/779
Update libraries.md

Removing full bladerunnerjs.org links
Update use_libraries.md

Additional docs fix following changes made in https://github.com/BladeRunnerJS/brjs/issues/779
follow -> following
lib.conf -> br-lib.conf
lib.conf -> br-lib.conf
Merge branch 'develop' into gh-pages