Add left colored bars to API docs for distinct code objects like methods

[Eric-Arellano]

See Figma.

Attributes should be purple

Methods and functions purple

Decide color for exceptions.

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To implement this, we'll need to wrap each code object in a <div> with an appropriate class name set on it. Then the docs app will need to add styling for those classes. Adding <div> to the markdown will be interesting - an alternative approach could be to develop a proper MDX component.

[frankharkins]

I vote for the MDX component as it might

• allow for more semantic tags (e.g. parameters/returns/raises should be h4)
• open up more interesting design possibilities such as indentation, having certain parts in a lighter font (like the old API docs), etc.