Docs update: make sure the right title shows up on Google

[ulfaslak]

Explicitly set the HTML title. Otherwise the title in Google Searches becomes "Schedule a Free Strategy Consultation — pymc-marketing 0.9" which is not great.

I BELIEVE this will solve the problem which is that currently, when you Google "PyMC-Marketing", it shows up like:

That is not great. Should be:

When we merge this, it might take while for the change to show up on Google Searches too, so we need patience. But it needs to get fixed, it's not good for the funnel

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.91%. Comparing base (ec466b9) to head (2ab65b6).
Report is 100 commits behind head on main.

Additional details and impacted files

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##             main    #1074   +/-   ##
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  Coverage   95.91%   95.91%           
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  Files          39       39           
  Lines        3966     3966           
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  Hits         3804     3804           
  Misses        162      162           

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