📝 write C-PAC tutorials

[tamsinrogers]

see https://fcp-indi.github.io/cpac-docs/pages/tutorials.html

Needed: descriptive tutorials for working with C-PAC/achieving specific results with C-PAC.

For example:

• Troubleshooting a C-PAC Run
• 📝 Tutorial: Optimizing Memory #112
• Forking
• Using Ingress
• Reading Provenance
• Interpreting Results
• Understanding Raw Data/BIDS
• CPU Strategies

How to Contribute:

• Create a new branch for your additions
• Add your content changes in the corresponding yaml for the page being edited
• Open a content-related PR that targets the appropriate tutorial yaml to suggest changes.