Add API docs and how-to-guide directives

Placed directives in 'components' directory
Update getting-started guide to use API and how-to directives
Merge pull request #272 from matthewdunsdon/web/feature/api-and-how-to-directives

Add API docs and how-to-guide directives
Completed interactive axis how-to guide
Added <api-docs> links
Added 'insight.' to API links and removed whitespace
Merge pull request #273 from niksoper/webfeature/how-to/interactive

Introducing a how-to guide for using an interactive axis
Created multiple series how-to page and closed div in interactive.html

- Created multiple series controller
- Added route to app.routes
Added content to multiple series how-to guide

- Updated multipleseries controller with chart code
Merge pull request #274 from tylerferguson/web-feature/multiple-series-how-to

Added multiple series how-to guide
adding updated routes and dist to branch
Merge branch 'gh-pages-dev' of https://github.com/ScottLogic/insight into feature/how-to-legend
created chart section and folded relevent sub-sections into it