Create e2e tests for the site

[jilarganti]

Test cases:

• [x] - broken external links
• [x] - links on github
• [x] - PageSpeed ​​Insights link
• [x] - Stackblitz Publisher links

[jilarganti]

broken external links

"test:links": "pnpm exec linkinator '*/.md' --verbosity ERROR -s 'example, zoom, openai'",

links on github

unnecessary links removed https://github.com/jilarganti/arvis/commit/c03e78ce28ab35aad85dd88e7d398c9a5fc8aa65

[jilarganti]