Add Bull Bitcoin to case studies page

[thunderbiscuit]

This PR adds Bull Bitcoin and BitMask to the case studies page.

cc @BullishNode
cc @cryptoquick

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[danielabrozzoni]

This looks really good! A couple of nits:

• At the moment bitmask is out of center, I think we should use a 1:1 logo (similar to the mutiny one, with a transparent border on top and bottom)

• Doesn't have to be fixed here, but maybe the icons of the projects should have a max size? From desktop they look quite big, compared to, for example, the ldk website:
  
  

[ConorOkus]

@thunderbiscuit great job on getting this in. I'd just say try to optimize the images to be something like 130*130. That's what we have over on the LDK side anyway

[thunderbiscuit]

Thank you for the comments!

This PR now fixes the size of the images, the length of some of the taglines, and adds the 2 new projects.

[notmandatory]

Looks good! ACK b56cf15