ENH: Optional QuantEcon logo in titlebar with Theme Adjustments

[mmcky]

This PR

• enables configuration to remove the QuantEcon logo from the titlebar
• adds in footer text to indicate the theme was made by QuantEcon
• updates some theme colours when quantecon_project = False

Usage

html_theme_options = {
    ...
    "quantecon_project": False,
    ...
}

and if using Jupyter-book

sphinx:
  config:
    html_theme_options:
      quantecon_project: False

[codecov]

Codecov Report

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Additional details and impacted files

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  Misses          ?       70           
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