Repository sanitization and pathway for automatic deployment of docs

[akhilpandey95]

repo sanitization

• assess the structure of the repo to:
  • include docstring style documentation for all models, utils
  • include style guidelines, automated tests for linting
• include git conventions, branch creation strategies, recommended good practices for contribution
• include ISSUE_TEMPLATE, and guidelines for creating PR's to contributors

docs and auto-deployment

• modify the README to provide higher level idea, description, and example script to get started
• include necessary documentation resources within README and point to the docs site for elaborate usage/explanations of HydraGNN
• mention about HPC component of running HydraGNN on exascale compute clusters like Frontier, etc.
• test the feasibility of either using pdoc3 or readthedocs to ensure documentation of the website is automatically pushed to a connected web endpoint