move publish content to public folder + add ci

.gitlab-ci.yml

public/common.css

public/images/rust-logo-128x128.png

public/images/rust-logo-256x256.png

public/images/rustwasm.png

public/images/wasm-logo.png

public/images/wasm-pack-logo.png

public/lib/mermaid.css

public/lib/mermaid.dark.css

public/lib/mermaid.min.js

public/lib/remark-latest.min.js

public/rustkathon2019_1/wasm/index.html

public/rustkathon2019_1/wasm/markdown.md