[Migration] Warnings Issued by sphinx-tomyst build of myst

[mmcky]

Here is the build output for the current sphinx-tomyst build of the myst files from lecture-source-ds

~/repos-collab/lecture-source-ds  sphinx-tomyst ✔                                                                                             24d22h  
▶ make clean && make myst       
Removing everything under '_build'...
Running Sphinx v3.1.2
making output directory... done
/lecture-source-ds/conf.py:432: RemovedInSphinx40Warning: The app.add_stylesheet() is deprecated. Please use app.add_css_file() instead.
  app.add_stylesheet('css/custom.css')
WARNING: html_static_path entry '_static' does not exist
building [mo]: targets for 0 po files that are out of date
building [myst]: targets for 47 source files that are out of date
updating environment: [new config] 47 added, 0 changed, 0 removed
checking for /lecture-source-ds/src/applications/applications.bib in bibtex cache... not found                         
parsing bibtex file /lecture-source-ds/src/applications/applications.bib... parsed 17 entries
checking for /lecture-source-ds/src/applications/applications.bib in bibtex cache... up to date                        
checking for /lecture-source-ds/src/applications/applications.bib in bibtex cache... up to date                        
checking for /lecture-source-ds/src/applications/applications.bib in bibtex cache... up to date                        
reading sources... [100%] scientific/randomness                                                                                                        
/lecture-source-ds/src/applications/regression.rst:271: WARNING: Inline interpreted text or phrase reference start-string without end-string.
/lecture-source-ds/src/applications/visualization_rules.rst:3: WARNING: Duplicate explicit target name: "this article".
/lecture-source-ds/src/python_fundamentals/basics.rst:897: WARNING: Inline emphasis start-string without end-string.
/lecture-source-ds/src/python_fundamentals/basics.rst:897: WARNING: Inline emphasis start-string without end-string.
looking for now-outdated files... none found
pickling environment... done
checking consistency... lecture-source-ds/src/problem_sets/index.rst: WARNING: document isn't included in any toctree
done
preparing documents... done
CONFIG [definition_list] support for definition list in myst requires:                                                                                 
            myst_deflist_enable = True
        to be specified in the conf.py
CONFIG [definition_list] support for definition list in myst requires:                                                                                 
            myst_deflist_enable = True
        to be specified in the conf.py
CONFIG [definition_list] support for definition list in myst requires:                                                                                 
            myst_deflist_enable = True
        to be specified in the conf.py
CONFIG [definition_list] support for definition list in myst requires:                                                                                 
            myst_deflist_enable = True
        to be specified in the conf.py
writing output... [100%] scientific/randomness                                                                                                         
WARNING: SKIP python_fundamentals/collections [transition] objects are not supported by sphinx-tomyst
build succeeded, 7 warnings.