Improved UX for editing page headers & dashboard title

[nielsdejong]

Made the following changes to improve the UX:

• Dashboard titles are auto-saved when a user types a character (debounced)
• Editing mode for an input mode is automatically disabled if the user hits enter, or switches focus in the page.
• Input boxes now adjust to the width of the text.
• Styling of the text inside the input box is now closer to the style of the 'read' version, preserving logical context.

Bonus feature: added a small workaround for overriding default styling for graph visualizations in dark mode.

[sonarcloud[bot]]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

3 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (52426c8) 39.04% compared to head (6924d0c) 38.98%. Report is 1 commits behind head on develop.

Files	Patch %	Lines
src/dashboard/header/DashboardHeaderPageTitle.tsx	15.00%	17 Missing :warning:
src/dashboard/header/DashboardTitle.tsx	7.14%	13 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #743 +/- ## =========================================== - Coverage 39.04% 38.98% -0.07% =========================================== Files 208 208 Lines 8718 8740 +22 Branches 2597 2602 +5 =========================================== + Hits 3404 3407 +3 - Misses 5252 5271 +19 Partials 62 62 ```

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