Add container/layout functionality for basic page layouts

[ben-ryder]

Describe the feature This would include adding a number of container layout, replacing the existing "JContentSection" component:

• Max width containers, including the JContentSection max width and others. This would include a max width and padding for small devices. Max widths should include 768px & 1000px.
• Predefined component spacing classes?

Additional context How would this related to app layouts like the RibbonLayout from #51? Are there other common layout I could include like centered content with side menu/table of contents?

[ben-ryder]

<JLayout../> - Full blown layouts, such as <JLayoutRibbon /> etc

<JContainer.../> - Simple max-width containers that apply automatic gutter padding & spacing between container sections. Such as <JContainerLarge /> and <JContainerSmall />