Vetr-summarizer

- Add search functionality for class objects.
- Add Cisco ACI Best Practices Quick Summary link: [Ref](https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-aci-best-practices-quick-summary.html).
- Update README.

- Extend the HTML template (`base.j2` and `vetr-data.j2`)
- Add some CSS classes.
- Add toggle all button.
- Add index column in tables.
- Customize the DataTables to add Copy, CSV, and Column Visibility buttons.
- Add column reordering to to DataTable.
- Add fixed header feature to DataTable.
- Update README.

- Convert the codebase to OOP.
- Update the HTML footer section.
- Update README.

- Update CSS styling in the vetr-summary.html file.
- Verbose output for `--help` with default values.
- Update README.

- Initial release.