this is intended to fix the graphics

* as not scaleable bitmap/png
* with broken capitalization
* not easy editable plaintext for git

have a view[1] on the suggestion for an example[0].


[0]:
https://github.com/bitcoin/bips/blob/master/bip-0174/coinjoin-workflow.png
[1]: https://de.sharelatex.com/read/hrvvwcvhrbyz