chore(ia): Move Tutorials into MDN dir

[bsmth]

Description

Moving the Tutorials dir (doc) into:

./files/en-us/mdn
├── community
├── kitchensink
├── tutorials
└── writing_guidelines

Motivation

Docs IA & maintenance tasks

[github-actions]

Preview URLs

• /en-US/docs/MDN/Tutorials
• /en-US/docs/MDN
• /en-US/docs/Web

Flaws (2)

Note! 2 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/MDN
Title: MDN Web Docs
Flaw count: 2

• broken_links:
  • Can't resolve /en-US/about
• unknown:
  • No generic content config found

External URLs (2)

URL: /en-US/docs/MDN/Tutorials
Title: Web development tutorials

• https://estelle.github.io/CSS/selectors/exercises/specificity.html (1 time) (Note! This may be a new URL 👀)
• https://www.theblogstarter.com/html-for-beginners/ (1 time) (Note! This may be a new URL 👀)