NEAR API section (ex. JavaScript API)

[garikbesson]

No description provided.

[gagdiez]

@garikbesson lets better use near-api-rs instead of the json rpc, and lets delete the other API files that will not be used anymore

[PiVortex]

This PR helps #2321 but does not include the Python API and how to sign a message as the APIs do not implement a specific method to do this

[PiVortex]

The examples have been migrated under near-examples and the snippets will need updating accordingly (just ctrl+F)
https://github.com/near-examples/near-api-examples

There is now an added example in there in js for signing and sending a transaction in a lower-level way and one for verifying signatures (but this verifying signatures should be used in the example for verifying messages as per NEP 413 when a method for this is added)

[garikbesson]

@PiVortex amazing work, thank you! It would be nice to have Response Examples for each example as well, but we can create another issue for that

Since near-api-examples are migrated to proper organization, let's change code snippets URLs here. After that I think PR can be merged