Config docs

[dnephin]

Includes these changes:

• docs/config.rst - documentation for defaults.js
• add link to README.md and make docker docs more concise
• sort dependencies to prevent duplicates and merge conflicts
• re-order defaults.js so that related configuration options are together

The codegen settings don't do anything with these defaults, so I wasn't able to provide much detail.

[mohsen1]

@dnephin Thanks for this PR. I'm making some modifications to the README while I'm merging this.

Please take a look and let me know if you're okay with this:

https://github.com/wordnik/swagger-editor/blob/dnephin-config_docs/README.md

[dnephin]

@mohsen1

I think your edit is misleading. The config section is under the Docker section, but they are not related.

The config section applies to everything under "Running Locally".

I believe it should be made it's own section under "Running Locally", not Development

[mohsen1]

@dnephin Cool. Fixed those issues and also Node.js version you brought up in the comments in my other commit. Merged to master.

Thanks!

[dnephin]

Thanks! looks good