remove redundant examples

[richrines1]

the examples/ subdirectories in css and qss have been superseded by the docs/ directory

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[bharat-thotakura]

We currently don't have a notebook to showcase the resource_estimate() method on read-the-docs. Do we want a full notebook for it or is the API reference and docstring sufficient? Alternatively, we could have a dedicated 'advanced/general superstaq features' notebook as a sequel to basics & account_info that highlights things like resource_estimate, and features like in #761

[richrines1]

i think we decided way back that resource_estimate() itself didn't really warrant a demo yet? (the endpoint is pretty under-developed atm, and will probably change substantially before it's useful)

that said i do really like the idea of adding an "advanced features" demo before the device-specific stuff. it also seems like the "basics" notebooks themselves could be extended a bit - currently they only showcase submission, but imo should at least demo compilation as well

[bharat-thotakura]

Ah I see, I wasn't aware of that decision. But yeah, I agree with the reasoning given the current state of resource_estimate