Fix broken links and references in Bigbang documentation

Need to go through all files in docs and charter and update or remove invalid reverences.

Specific things to look for:

• Dev values have been moved to docs/example_configs
• Hacks folder was removed and some scripts have been moved to scripts folder.
• All pipeline related files and scripts have been moved to pipeline-templates project.

AC

• All files in docs have no invalid links or references to files that no longer exist.
• All files in charter have no invalid links or references to files that no longer exist.