HW-411: Styled dashboard to near mockup

[mukeshcompucorp]

Description: This PR fixes below issues,

1. Tabs of dashboard to look same as navigation of activity pane.
2. Make dashboard background color and padding changes to make it look more near mockup
3. Jump/Snagging of filters on activity and dashboard activity tabs
4. Remove Jumping of page when viewing case activity with only 1/2 activities in the list
5. Fix placeholders
6. Remove extra CSS classes of checkboxes/radio from styling

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@guanhuan This covers our blocker points from below,

• [x] 1. Tabset on dashboard should match the style on caselist
• [x] 2. Activity feed on dashboard:
  • [x] 2.1 whitespace on top needs to be removed
  • [x] 2.2 filters should match how they look on caselist
  • [x] 2.3 separators
  • [x] 2.4 can we remove the extra white panel within the tab
• [x] 3. When only 1 activity on activity feed this is jumpy
• [ ] 4. Recent cases dashlet
• [ ] 5. Line shouldn't show when activity card is not in feed. Next activity column on case table view.
• [x] 6. Acitivty tab on caselist
• [ ] 7. Loading skeleton for caselist https://dribbble.com/shots/2510775-Skeleton-pattern
• [x] 8. Check all placeholders to make sure that colour and font are consistent
• [x] 9. File upload region need to look like https://demo.civihrhosting.co.uk/civicrm/tasksassignments/dashboard#/documents
• [x] 10. Checkboxes are not aligned correctly