Move content directly into wai-website

[remibetin]

⚠️ Dependencies

• Merge https://github.com/w3c/wai-website-theme/pull/83 with this PR
• Merge https://github.com/w3c/wai-website-data/pull/143 with this PR

Repositories moved:

• https://github.com/w3c/wai-customize-design
• https://github.com/w3c/wai-wcag-mob-overlap
• https://github.com/w3c/wai-shared-experiences
• https://github.com/w3c/wai-intro-act
• https://github.com/w3c/wai-intro-earl
• https://github.com/w3c/wai-combined-expertise
• https://github.com/w3c/wai-inclusion

Other changes

• Add Issues templates
• Add automatic Issues labeler
• Delete "_includes/read-this-first.html" symlink related from wai-aria-practices: original file was deleted by https://github.com/w3c/wai-aria-practices/commit/91cedca5082b4a31683ed8f13e4dd5f3cb603644

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