sgx

As described in #275, please help me with the documentation of SGX SDK:

• Move existing wiki into the /documents/ directory
• Write tutorial and tips of using SGX SDK to build SGX application
• Cleanup the /documents/ directory

This documents will be rendered in our homepage (https://teaclave.apache.org/sgx-sdk-docs/). Thank you so much!

Hi, I am getting error when running ./run-teaclave-services.sh.

Platform: Azure CC VM
OS: Ubuntu 18.04
Docker Image used: teaclave-build-ubuntu-1804-sgx-dcap-1.11:0.1.5

Error:
**~/incubator-teaclave/docker$ ./run-teaclave-services.sh
/dev/isgx device detected.
/var/run/aesmd/aesm.socket socket detected.
Error: No such volume: aesmd-socket
COMMAND: docker-compose -f docker-compose

Since raw queries only return encrypted keys, it's pointless and will break implementations coming from other networks without letting anyone know.

We should remove it from the next version

Various bits of the Veracruz codebase are quite opinionated about the relative sizes of various Rust types, e.g. conversions between usize and u64 are quite common. Technically speaking, these conversions can fail at runtime due to usize not being a fixed-width type in Rust, and these conversions mark one of the few places we still have calls to expect() and unwrap() in the runtime's co