Polish UI and clean up code

[otech47]

Leaving a checklist here to take care of when we are closer to a stable release. These should only be minor tasks of low priority

Code Cleanup

• Ensure all instances of var x = require('npm-package') are refactored to ECMA standards as import x from 'npm-package'
• Ensure all program structure elements including imported variables, functions, and reducer-action types are logically grouped and alphabetized for better readability
• Remove any unnecessary function call indents (ex: const startOfWeek = moment().startOf('isoWeek') can stay on a single line since it doesn't wrap on most screen sizes
• Address Close Issue #8 and #12 #15 (comment)

UI Polish

• Fix alignment for Setblocks scheduled within the same day and make sure the setblock dots (on both the sidebar and the main page are perfect squares instead of rectangles
  

• Fix alignment on the empty state UI "This user hasn't committed..."
  

• Remove "Set Team" component from Team Page and add a simple "Team" header

• On the TeamPage, make sure the color bubbles are vertically center-aligned

• On the TeamPage, make sure the team member names are vertically left-aligned

• On the TeamPage, remove the filter/sliders icon on the right

• On the Schedule Page, change "Hours Counter: X" text to "X work hours scheduled"

• On the SideBar, the small setblocks should be vertically left/center-aligned

• Change What issues are you going to work on? to `What are you going to work on?

• When rendering half-setblocks that have been scheduled, the times should show which half is scheduled. So when a half-block is scheduled for 12am - 4am, the user should see either 12am - 2am or 2am - 4am