✨ Create-tina-app - add starter template descriptions

[wicksipedia]

cc @matt-goldman @levijj22 @kikibianc

As per request from @adamcogan (subject: Tina - Starter descriptions) - he wanted to add some descriptions to the templates in the create-tina-app cli.

I also had to pay off the following tech debt to get the code compiling (I use zsh-nvm - see https://wicksipedia.com/blog/terminal-setup) and running (since the readme was a TODO)

• nvmrc - updated to align version with project documentation
• gha - modified setup-node tasks to use .nvmrc file -> required workflows will need to be changed after this pr is merged (removed unused node version from matrix)
• readme - added documentation on how to get started developing create-tina-app
• create-tina-app - added descriptions to starter templates

Demo of changes:

https://github.com/tinacms/tinacms/assets/600044/af82b5c5-8cbd-4bd4-8f82-2f5685a40adc

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 61745ace334dab6e9a95c3a96908b3b33cd24f18

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | create-tina-app | Patch |

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[CLAassistant]

All committers have signed the CLA.

[wicksipedia]

required workflows will need to be changed after this pr is merged (removed unused node version from matrix)

done