replace JavaScript SDK related tutorials with official docs and add more guides #92
Description
it should still be linked in the README in a meaningful structure:
- How to Register and Update a Name with the SDK in Javascript
-> https://docs.aeternity.com/aepp-sdk-js/latest/guides/aens - Smart Contract usage with the Javascript SDK
-> https://docs.aeternity.com/aepp-sdk-js/latest/guides/contracts
also, more guides included in the official JS docs should be linked to