readme files: use html: details

Readme files are meant to be written and read. This collection over videos mentions some things you can do to make them stand out a bit more.

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Notes

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

<details>
  <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
</details>

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

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