Fix planner header wrap and center planner settings button cogwheel

[jloh02]

Context

Fix #3703

Implementation

Just CSS changes and removal of margin when "Settings" word removed

Possible Improvements

There's a few UI minor details which I felt could've been done better but considering that we can release the planner then fix these minor things I'm going to leave these points here

• When the beta button is removed, the header text are not visually centered
• The module statistics portion ("0 Courses / 0 Units") should be right aligned especially at the smaller screen levels when the text is wrapped

Screenshots

370px width with beta button:

500px width with beta button:

900px width with beta button:

1600px width with beta button:

370px width without beta button:

500px width without beta button:

900px width without beta button:

1600px width without beta button:

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 53.57%. Comparing base (e2253bd) to head (7d47960).

Files	Patch %	Lines
...ebsite/src/views/planner/PlannerSettingsButton.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3704 +/- ## ========================================== - Coverage 53.58% 53.57% -0.01% ========================================== Files 273 273 Lines 5983 5984 +1 Branches 1429 1430 +1 ========================================== Hits 3206 3206 - Misses 2777 2778 +1 ```

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[kokrui]

FYI we plan to keep the Beta - Send Feedback button for a sem or two still after releasing the planner! (though maybe change the text to "Send Feedback")