Also:
- rename some files to remove redundant information from the filenames
- rename many labels to match the filename and its place in the hierarchy
- move lua_api under the scripting section
* Add information about multiple instances
* Document better how the lua config files work
* Document how lua config files get merged from different places
* Copy over additional documentation for ALSA from pw-media-session
* Fix rst syntax issues
- use code blocks properly
- use note/important blocks
- stop using ` for emphasis, use `` or * appropriately
- update info on contributing, community, running, logging
