readme files logo readme files: use html: details

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Here's the two examples that we've added.

  <summary><b>Need help with copy/paste?</b></summary>
  You can copy and paste this code by using these shortcuts;

  - <kbd>CMD/CTRL</kbd> + <kbd>C</kbd>: to copy
  - <kbd>CMD/CTRL</kbd> + <kbd>V</kbd>: to paste

Note that you can see the finished readme on github too.