Fixing static file access

• Switched to using find: to locate packages under src/ instead of manually listing
• Changed rapidpe_rift_pipe.static to include all file types
• Added more explicit file type spec for rapidpe_rift_pipe.config_files
• Made rapidpe_rift_pipe.config_files into a proper package with __init__.py
• Deleted some related old commented-out config

Fixes #99 (closed)