chore: improve seo - #82

Changed pages include:

• index.html - view
• 404.html - view
• 404/index.html - view
• about/index.html - view
• avis/index.html - view
• camus-has-already-said-a-lot-about-the-pandemic/index.html - view
• droop-shady/index.html - view
• fud-and-how-to-make-decisions-in-the-ai-era/index.html - view
• so-you-really-want-to-open-source-your-project/index.html - view
• three-books-recommended-for-the-1/index.html - view

There are more changes not included in the list