Improve the editor HTML template

- Darken the header tab background to match the default editor
  background color.
- Hide the distracting focus outlines for the editor and game canvas.
- Use a pure black background for the game canvas to better distinguish it
  from the editor and provide a more neutral background.
- Use a bold font weight for the Start Godot editor button on the
  loader page.
- Link to the web editor documentation on the loader page.
- Clarify what happens when clicking "OK" in the persistent data removal
  warning dialog.
- Tidy up the HTML template by removing obsolete attributes.

0 files changed, 0 insertions, 0 deletions