Update `Browser Support` table

Changes:

* Updated the URLs in order to always get the latest version of the browser logos (this also takes care of updating to Safari logo).
* Rearrange browsers in alphabetical order.

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@zenorocha Notes:

* The URLs for the popular browser won't change, but if you want I can change the links to point to the latest [release](https://github.com/alrra/browser-logos/releases).
* The request images are a little bit bigger so that the logos look decent on all types of screens.

Let me know if I need to change anything else.