Last few tweaks to the quickstart & advanced-analysis tutorial

[ismael-mendoza]

This PR will adjust the following two notebooks so they are ready to be released alongside the BTK paper:

• quickstart
• advanced-analysis

In advanced-analysis, I'm also tidying up the plots to be "paper-ready". Other todo items:

• investigate some of the warnings raised by advanced-analysis or understand why they happen.

In the end, when looking into the above to-do item I discovered some bugs in the matching procedure. So I'm fixing them here too.

[review-notebook-app]

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Codecov Report

Attention: Patch coverage is 24.07407% with 41 lines in your changes are missing coverage. Please review.

Project coverage is 62.76%. Comparing base (180bf61) to head (cead309).

❗ Current head cead309 differs from pull request most recent head 655ce30. Consider uploading reports for the commit 655ce30 to get more accurate results

Files	Patch %	Lines
btk/match.py	33.33%	22 Missing ⚠️
btk/measure.py	13.33%	13 Missing ⚠️
btk/deblend.py	0.00%	5 Missing ⚠️
btk/plotting.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #477      +/-   ##
==========================================
- Coverage   63.90%   62.76%   -1.14%     
==========================================
  Files          19       19              
  Lines        1568     1598      +30     
==========================================
+ Hits         1002     1003       +1     
- Misses        566      595      +29     

Flag	Coverage Δ
unittests	62.76% <24.07%> (-1.14%)	⬇️

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