[openstreetmap/openstreetmap-website] Improve link and button styles (#2716)

[Wille Marcel]

@gravitystorm [suggested me](https://twitter.com/gravitystorm/status/1283697101977923590) to open an issue to discuss link/button styles.

I think we need a better colour palette definition to the website. We have 2 blue tones to buttons and links, and they don't combine well with other parts of the website. Some examples:

- Share map active button is green. Link active button is blue. The `geo` link (`#24d`) adds a third blue tone to the screen and looks like an unformatted link.

![image](https://user-images.githubusercontent.com/666291/87871200-d6830c00-c984-11ea-8cba-d33a0ee23cc4.png)

- On the Diaries, the blue colour for the links doesn't look harmonic with other colours on the page. The + button is darker than the buttons we see in other parts of the website.

![Screen Shot 2020-07-19 at 05 58 52](https://user-images.githubusercontent.com/666291/87871219-f5819e00-c984-11ea-9a88-a8b4023d6f3a.png)



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