Rework documentation on types-support, and typegen

[TarikGul]

Currently with the update from the polkadot repo, to polkadot-sdk, and the runtime moving to the fellowship, the current documentation in types-support is out of date. It requires a few extra steps to just get the dev environment working for each chain. It would be more comprehensive and help other maintainers work through the general maintenance process.

It came to mind when I was updating the static metadata to the newest versions. It would be good if we maintain documentation for both the leegacy workflow, and the new workflow required for the type generation.

TODO:

• Bump Substrate
• Bump polkadot
• Bump kusama
• Rework docs to show legacy, and current workflow

[TarikGul]

Reference to current docs that are out of date: https://github.com/polkadot-js/api/blob/master/packages/types-support/src/metadata/README.md

[TarikGul]

This could use a rework of: https://github.com/polkadot-js/api/blob/master/scripts/metadata-get.mjs

[polkadot-js-bot]

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