Implement muuri grid system

[ianmuchyri]

What type of PR is this?

• [ ] Refactor
• [x] Feature
• [ ] Bug Fix
• [ ] Optimization
• [ ] Documentation Update
• [ ] Dependency Update

What does this do?

Creates a Dashboard canvas grid layout based on the Muuri library. This allows a user to select a widget from a list of available widgets, add some data, and then add it to the canvas. The user can toggle between edit mode and view mode.

Which issue(s) does this PR fix/relate to?

• Related Issue #81
• Related Issue #92
• Resolves #

Have you included tests for your changes?

• [ ] Yes
• [x] No, and this is why:

Did you document any new/modified functionality?

• [ ] Yes
• [x] No, and this is why:

Notes