new icon: Bitcoin (original, original-wordmark)

[x] PR does not match another non-stale PR currently opened
[x] PR name matches the format new icon: Icon name (versions separated by comma). More details here
[x] PR's base is the develop branch.
[x] Your icons are inside a folder as seen here
[x] SVG matches the standards laid out here
[x] A new object is added in the devicon.json file at the correct alphabetic position as seen here

This PR closes NONE

Link to prove your SVG is correct and up-to-date.