Update README.md

Implement drag and drop for tasks

Add dark color for add column column

Update README.md

Update README.md

Fix eslint error

Merge pull request #2 from dodoburner/responsive-design

Create add column column

Update hover states and other misc styles (mostly)

Update sizings

Add dark theme for sidebar

Fix sidebar overlapping modals

Add new board from the sidebar

Update sizings of elements for tablet version

Create show/hide sidebar functionality