feat(docs): Adds mkdocs for project documentation

[dutterbutter]

Changes

Builds off of documentation from #330

• Adds docs dir which contains documentation sections
• Adds docs github action workflow

TODO

• Outline CLI commands in docs/usage/command-line.md
• Outline configuration options in docs/usage/configuration.md
• Add and reference contributions.md file
• Outline steps and images for interacting with PINT using polkadot.js ui
• Add documentation for running test suite and debugging
• Update and add documentation for running PINT using docker

Tests

mkdocs serve

Visit http://127.0.0.1:8000/

Issues

• Related to Documentation #224

[CLAassistant]

All committers have signed the CLA.

[Redoudou]

Thank you guys

[mattsse]

Nice,
@clearloop can you perhaps add a brief overview of:

• what is e2e?
• what purpose?

So that it's clear that this is intended for cross chain testing

[clearloop]

Should we add a chapter of debugging and introduce root call? most of the calls of PINT can not run independent before adding asset ( or creating a feed first )

[mattsse]

Should we add a chapter of debugging and introduce root call? most of the calls of PINT can not run independent before adding asset ( or creating a feed first )

I'll describe these in a dedicated section that describeds the asset-index logic

[mattsse]

lgtm