Move to wasm-pack and other WASM build refactoring

[ishitatsuyuki]

Merry Christmas!

Some technical debts:

• A target symlink is included until support of workspace is implemented.
• The Material design related libraries and icons are not actively getting developed. We probably want to move to our own CSS design at some point.

[ishitatsuyuki]

TODO: get wasm-pack into the CI environment.

[cmtt]

Hello @ishitatsuyuki, this is great work. We should address UI-related issues separately, e.g. after successful merge in a separate PR.

There are some issues:

• the build is broken as clippy is currently missing for the most recent Rust version, issue CI build broken due to missing Clippy component  #111 has been created therefore for the record.
• Please remove all files specific to the yarn package manager from the repository, as NPM is used by default and on CI.
• Commit a package-lock.json.
• Move index.html to src. The raw HTML could also be replaced with a template in this PR or in a separate one. Parcel provides support for the pug template language.
• A (minimal) playground/README.md should be created, describing its purpose as well as the commands required to start the development server / the build.
• @maciejhirsz, we should consider using GH pages for deployment as suggested in Deploy ratel-wasm using CI, MIME type #77.

[ishitatsuyuki]

I'm planning to add GitHub pages deployment sometime soon. To proceed, I need someone with privileges to do the following:

• Decide which repository we would publish the pages and setup (configure) GitHub pages. It could be a branch of this repository, or a new organization-wide repository.

• Obtain a token with push access. This could be:

  • Personal access token with your account
  • Personal access token with a new bot account
  • A token for a new private GitHub app (not tested)

  Then, add this token privately to Travis CI's environment as GH_TOKEN.

[cmtt]

Thank you for the update. This is a good starting point for some UI updates after this PR has been merged.
@maciejhirsz, I'd propose to deploy the wasm build in a gh-pages branch until there is a website to integrate it into. Can you take it from here?

[ishitatsuyuki]

@cmtt Is there anything left to review, or you're just waiting for @maciejhirsz's approval?

[maciejhirsz]

Just waiting for me, I took a break from coding during the holidays :).