Improve CLI subcommand organisation and convert docs to Material for Mkdocs

Contents (#738)

IMPORTANT: There is 1 breaking change.

Enhancements

• Update version compatibility table script for markdown format

Dependencies

• Add mkdocs-material
• Add mkdocs-glightbox to provide image zooming to docs
• Remove dependencies and config from old documentation
• Add tabulate for version table script

Refactoring

• 💥 BREAKING CHANGE: Replace octue twined start CLI subcommand with octue twined service start subcommand

Reversions

• Revert "REF: Remove google_crc32c warning suppression"

Other

• Convert documentation from restructured text (RST) to markdown (MD)
• Use mkdocs and Material for Mkdocs to build and theme documentation
• Document using TWINED_SERVICES_TOPIC_NAME envvar
• Disable sphinx pre-commit step
• Update CLI printout in readme
• Replace "Octue SDK" with "Twined" in docs
• Move CONTRIBUTING.md to repo root and update it

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Upgrade instructions

💥 Replace `octue twined start` CLI subcommand with `octue twined service start` subcommand

Use octue twined service start instead of octue twined start