[Docs] More info for contributors

[w96k]

There is no useful information for contributors in current docs. I found still useful pages in legacy docs tho, would be nice to port them to the current docs.

• https://legacy.semantic-ui.com/spec/docs/module.commented.html
• https://legacy.semantic-ui.com/guide/javascriptguide.html
• https://legacy.semantic-ui.com/guide/styleguide.html
• https://legacy.semantic-ui.com/guide/cssguide.html

Also, I can see in repo some linting tools that not mentioned in docs or contributing page. There are .csslintrc and .jshintrc. Legacy docs have a mention of Airbnb js code-style.

And one more thing, I find very useful all ui on one page from 1.x docs:
http://1.semantic-ui.com/kitchen-sink.html

Putting all stuff together:

• Add module format description
• Add information about js code style and linting tool
• Add information about css (less) code style and linting tool
• Add information about naming conventions for class names

[y0hami]

I have been planning out a new module I want to build and having these on the website would of helped me quite a bit so I definitely think we should add something like this 👍

[jlukic]

There's also http://learnsemantic.com/ which i never got to flesh out

[stale]

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