What it Does

Closes #217
This change adds the tutorial links to the sidebar of the documentation. It also removes the tutorial link from within one of the articles (the previous PR) since it is no longer necessary.

How I Tested

Step 1: Fix and Build Documentation:

Use Runestone app documentation as a guide by downloading and building the documentation
Open up Basic-Car-Maintenance .MD files and edit for formatting/layout
Build Documentation by using Product -> Build Documentation

Step 2: Verify Documentation/Hosting:

Commit changes (testing the hosting site adds files that are not to be committed, so this step is important)
modify build-docc.sh script and change hosting-base-path to equal an empty string, so --hosting-base-path ""
run ./build-docc.sh in local repo directory
run /opt/homebrew/bin/python3 -m http.server -d .docs to host documentation on local host
run localhost:8000 in private browser to see documenation
Verify documentation is working
Clean area and push the original commits; otherwise clean area and continue fixing

I was able to host the tutorials in the sidebar by updating the .MD file formatting. I have provided some of the major highlight areas in a screenshot below.
MD formatting is extremely picky. Wrong formatting causes issues.
The MD formatting tells the documentation to override the default organization of the Xcode build documentation process. It looks like this was needed for the tutorials, and was seen in Runestone's documentation as well.
More information on needed MD file formatting can be found in Apple's documentation, in Apple's Adding structure to your documentation page, subsection Arrange top level symbols using topic groups.

Tutorials seen in hosted documentation site.

Xcode Build Documentation for comparison

MD file significant formatting notes