AOS-40 - Include create-entry script to scaffold slotfills and entries

[stevenslack]

Summary

Adds the @alleyinteractive/create-entry script for scaffolding slotfills and entry points.

• Removes the example enqueues in favor of scaffolded entries.
• Allows the build process to run if the entries directory does not exist.
• Includes 2 new scripts in package.json:
  • create-entry
  • create-slotfill
• Updates the README with information on how to scaffold new slotfills and entry points.
• Removes the blocks directory from the scaffold directory. Solves [BUG]: Remove blocks folder from scaffold branch #206
• This PR solves Ability to scaffold a Gutenberg Slotfill #77 adding the ability to scaffold slotfills and entry points.

[renatonascalves]

🗡️