Adjustments in response to reviewer feedback

[lunamorrow]

Checklist of changes for review:

• Remove outdated README_worked-examples jupyter notebook and corresponding directory of test files
• Updated module import paths for PolyTop in 'paper_worked_examples.ipynb' and documentation worked examples
• New read/write parsers for AMBER, OPLS and CHARMM forcefield ITPs -> opened new issue Add support for AMBER, OPLS and CHARMM force fields #49

Other discussed changes:

• Remove automated builder

Maybe:

• New issue to setup parsers for other force fields to/from their respective topology files to/from PolyTop objects
• Add instructions for where to obtain monomer topologies and other details? (Reviewer 1, Q7)

[lunamorrow]

Most recent commit to remove the PolyConf/PolyTop automated polymer builder per request from @recombinatrix. The automated builder has been removed from the module code base and all documentation.

[lunamorrow]

Merging this into main for now. May need to make documentation more explicit, make a few changes to example ipynb and add CG example in later PR.