P-chain - Technical docs update

[abi87]

Why this should be merged

We have some technical documentation stored in platformvm package, which was not visible enough, nor updated. This PR start to tackle these issues.

How this works

Refreshed existing doc, drop outdated one and added a README at platformvm package level for visibility.

How this was tested

a human reading the doc

[abi87]

Thanks for putting this up!

I wonder what the best way to document the various transaction types on the P-Chain is. It seems like this is the last section that is still distributed throughout the rest of the docs making it a bit harder to follow. Do you think it makes sense to add one more doc enumerating each of the transaction types?

We do have the list in our officlal docs. I have mentioned the link in the doc

[meaghanfitzgerald]

@abi87 I plan on migrating all the api.md docs directly to the Avalanchego repo, and pulling into the docs, similar to how the this page is pulled directly from the AWM Relayer repo.

for example, i would move https://github.com/ava-labs/avalanche-docs/blob/master/docs/reference/avalanchego/p-chain/api.md to https://github.com/ava-labs/avalanchego/tree/master/vms/platformvm/ , and rename the file service.md (per @StephenButtolph 's request).

should we do the same for the transaction format file?

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