New JupyterBook introduction

[Swanson-Hysell]

This pull request adds:

• a new intro.md that introduces the project and directs the user to the two main DIY notebooks and succinctly provides additional information
• a new installation.md that contains the installation information previously in the GitHub readme
• updates logo.png to be a portion of Figure 1 that is more relevant to the book context than the Euler pole illustration
• adjusts the toc given the new files

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8e49ae7) 87.04% compared to head (6b631ee) 87.04%.
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main      #50   +/-   ##
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  Coverage   87.04%   87.04%           
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  Files           9        9           
  Lines         301      301           
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  Hits          262      262           
  Misses         39       39           

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[facusapienza21]

@Swanson-Hysell I am accepting the PR but I will later change the logo again: I was working in a simplified version of the previous logo to make it personalized for this work, but I will prefer to keep something cosmetic instead of the paper figure. Thanks for the JB updates!

[Swanson-Hysell]

The book is looking nice! Sounds good with regard to the logo. Note that the logo.png image (i.e. the snippet of Fig 1) is being called upon for the first graphic grid. So when you put in a new logo, go ahead and rename the current logo png as something else and update the associated file call in the intro.md.