Moderate redesign to feedback and get started pages

[diosmosis]

Description:

Fixes #1050

Changes:

• Remove about section from Get Started and change the order of the steps so users know they should think about privacy compliance before enabling tracking.
• Rename About page to Help and reorganize the section so feedback/help items are first and the "About matomo" section is last.
• Redirect to the Get Started page upon activation of the plugin.
• Show all tracking settings by default instead of hiding them based on the selected tracking mode. (This is done to support the reordering change to the Get Started page. There is some text that links to the settings page for disabling cookies, but this setting will currently only be visible if tracking is enabled, and we want people to be able to change this setting before enabling tracking.)

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed