Rewrite PriceModel marker rendering

[alextes]

This widget has logos that overlap sometimes, depending on shifts on real-world p/e ratios. It would be nice to rewrite which logos are visible using a system as found in the 200Y projection widget. In short:

• Make an ordered list of markers we have.
• From first to last, only render those markers which do not overlap with any of the markers with a lower index.
• ETH should be first on this list.
• The rest of the companies should be ordered by familiarity with the general public.
• PE ratios sometimes come back null from the API. Skip those.

[Greg-Johns]

Hi Alex, here's a take on the PE marker rendering issue. https://github.com/ultrasoundmoney/frontend/pull/254#issue-1465287175