Improved theme toggle

[arturbecker]

• Fixes the CSS for dark and light themes, which was inverted.
• The style of the theme toggle switch was changed to better signify it's "off" and "on" states. Now the "on state" has a primary-color background.
• It also changes the position of the theme toggle to the top of the page - in hopes any interaction with it occur before the reader goes through the entire page. It also gets a label when width allows it.
• Finally, and perhaps a bit off-topic, the title attribute of the contributors has the number of contributions made.

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