Feature/#7 yarn no gulp

[Quicksaver]

Important notes from the readme!

Requirements

1. hugo, install using homebrew if you don't have it already: brew install hugo
2. yarn, you'll probably want to install with brew install yarn --without-node as to not override your system's Node.js or if you use nvm to manage node versions.

Install and Run

1. Clone project locally
2. If upgrading an existing project from npm, or whenever you need to rebuild dependencies, run yarn rebuild (shortcut to rm -rf node_modules & yarn install that I wrote to myself and left in); otherwise grab dependencies normally with yarn install;
3. It's recommended to change the default port in package.json, to avoid having to worry about other Besugo projects being served on the same port.
4. yarn start task serves the site locally and starts listening for changes

Changes

Use yarn

• Closes #7
• should speed up dependency builds due to its local cache system
• yarn.lock is always commited to ensure dependencies are equal among peers

Removed everything-gulp

• Cleaner and more organized tasks
• Webpack up and running and ready to receive more tasks, for example for #27
• One less layer of abstraction when developing (gulp wrappers), so we can work more directly with whatever components we need

Moved src CMS config.yml file to another location

• to cms/config.yml
• avoids race conditions with hugo tasks
• CMS branch task only fires when that specific file is changed, as opposed to on every change like it did before

Changed some files and directory structure

• .css files no longer concatenated (for now), so no need for scss_cms folder
  • you can still use @import in the main file to concatenate whatever you want into it and keep only a single output file of course
• altered JS-files structure: ./js for vanilla-JS/jQuery files, ./scripts reserved for build files
  • more in tune with the classical app dev structure
  • output files are also changed, both site. and admin. are now called main.min.js (specifying site or admin in either file was redundant due to their location, and this way we can have a single webpack task for both files instead of separate tasks for each file)

Ignore intermediate files

• Using a ./temp folder for intermediate files generated by webpack/sass/whatever, so that hugo doesn't go nuts constantly copying everything to public; only final files need to go in ./public

Dev server port

• Can define the port at which the site is served locally directly from package.json
• We don't have to constantly worry about open processes when switching between projects
• When updating other project's Besugo tech stack, consider giving each a new unique port

Extra configurations in package.json

• Can define the compatibility list (browserList) in package.json, for readability and ease-of-finding mostly
• Ditto for sass configuration

Other notes

• This patch seems to have removed the occasional hugo build error/exception (harmless, running gulp again would build correctly)
• Uses sharp, the same library used by gulp-responsive (#12)

Related but non-critical tickets

• 20 - Add common polyfills

• 21 - Upgrade to latest Node.js 8 and Yarn 1

• 22 - Support more filetypes for uploaded responsive images

• 23 - Build srcset attributes automatically

• 24 - Cleaner console when serving locally

• 25 - sass-tasks as webpack tasks?

Obsoletes

• Closes #19 - gulp-responsive shows deprecation warnings

[pvhee]

@Quicksaver great work on this refactoring. This makes everything quite a lot simpler and in line with what most web projects currently use: i.e. yarn / webpack / node scripts