Update documentation to align with v4.0.0 release

## What documentation page needs changing?
All

## What documentation section needs changing?
All

## Proposed documentation change
Update all documentation to align with v4.0.0 release.  Since the entire build system will be changing from `gulp` to `rollup`, it will need a complete overhaul.

## Describe alternatives you've considered
n/a

## Additional context
n/a