odednaor

Update syscalls page

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Certain [syscalls](https://docs.starknet.io/documentation/architecture_and_concepts/Smart_Contracts/system-calls-cairo1/) are missing from the docs like `secp256r1` and `secp256k1`.

Change `StarkNet` to `Starknet` in the readme of the repo.

There is a limit on the number of felts a state diff of a single tx can have, which is not mentioned in the [limits](https://docs.starknet.io/tools/limits-and-triggers/) page in the docs. Waiting...

Adding a page on fee estimation

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**Is your feature request related to a problem? Please describe.** The docs don't contain a description of how to calculate fees (should be done based on the `starknet_estimateFee` call), or...