Made first half of Contributing.md collapsable

[likeajumprope]

Closes # .

Changes proposed in this pull request:

I have made the first half of the contributing.md file collapsable.
More changes to come.
This pull request is linked to issue #81

[htwangtw]

Well done! I added something minor to address.

[htwangtw]

You might want to remove the line skip and make it like this:

<summary><h4>Open Issue on GitHub :ticket:</h4></summary>

If you check the rendered version, the current header are not aligned with the triangle.

[shawnrhoads]

Just noticed this PR! Yay!! This is a great idea, @likeajumprope! Thanks for incorporating! 😄

I also have a few suggestions related to how the Markdown was rendered. Let me know if you'd like any help with these!

• Remove the line skip as suggested earlier by @htwangtw for the following lines:

  • 5-7
  • 15-17
  • 25-27
  • 47-50
  • 67-69
  • 78-80
  • 83-85

• The content inside the <ul> and <li> tags is also coming up a bit weird for me for the following lines (should we change to Markdown?:

  • 24-42
  • 56-62
  • 82-104

• Change the following hyperlinks to HTML (I don't think the inserting Markdown hyperlinks play nicely inside HTML tags) for the following lines:

  • 110 [Fork](https://help.github.com/articles/fork-a-repo) the [Brainhack Jupyter Book repository](https://github.com/brainhackorg/brainhack_jupyter_book) to your Github account :trident: to < a href="https://help.github.com/articles/fork-a-repo">Fork</a> the <a href="https://github.com/brainhackorg/brainhack_jupyter_book">Brainhack Jupyter Book repository</a> to your Github account :trident:
  • 124 [Clone](https://help.github.com/articles/cloning-a-repository) to <a href="https://help.github.com/articles/cloning-a-repository">Clone</a>

• Remove indentation on line 71

• Remove double spaces on lines:

  • 115 copy of the Brainhack Jupyter Book
  • 135 in the Brainhack Jupyter Book repository

Also, did you want the "Configuration" heading to be <h5>?

[Remi-Gau]

I think I will actually move the contributing to be actually a page in the jupyter book so as to make it easier to browse for users.