Support themes and show sequencing issues

[sgtwilko]

This started as a couple of tweaks and ended up with a load of changes. I've bumped the version number to version 2.0.0 as there's quite a few changes.

Changes:

• Update many packages to versions without issues.
• New theme (Modern which adapts light/dark from the currently selected DevOps theme)
• Task progress bar to show how completed a task is based on hours.
• Warnings about out of order tasks
• Settings page to configure new warnings
• Slightly reduce refresh rate when in focus, reduce a lot when the tab is out of focus to stop issues with API limits. #63
• Added Tags and Activities to the search (if you use Development as the activity type this will solve #89 )
• Fixed Capacity only using the first defined activity type #80
• Disabled LogRocket as it's throwing errors about being over capacity.
• some minor markdown fixes

[sgtwilko]

@yanivsegev Hiya, I realise life with children can get busy, so if you want I'm happy to fix the build issues if you let me have some access to the build environment, etc.

It may be helpful as there are several other bugs I'd like to fix, and there's a few issues listed here in GitHub I may be able to resolve. Let me know!