Deploy ratel-wasm using CI, MIME type

[cmtt]

In order to have the REPL up-to-date with each master deployment, it should be deployed to a static web host during CI.

Additionally, wasm files should be served with application/wasm as MIME type. This ensures that browsers can compile the application while streaming the resource.

Currently, the following error is logged:

wasm streaming compile failed: TypeError: Failed to execute 'compile' on 'WebAssembly':
Incorrect response MIME type. Expected 'application/wasm'.
falling back to ArrayBuffer instantiation

[ishitatsuyuki]

Working on rewrite of the WASM part with the awesome tools the WASM WG made. wasm-pack is brilliant!

[ishitatsuyuki]

Opened #110. As for deployment, I guess GitHub pages is the best bet currently because other providers such as Netlify is not good for management across the organization.

[ishitatsuyuki]

Status: waiting for confirmation and providing token, as described in #110 (comment).