launch week 5 blog posts

[Vadman97]

Summary

• adds php documentation
• fixes docs for c# not being linked from overview page
• adds next.js sourcemap blog post
• adds @vercel/otel blog post
• adds clickhouse performance blog post

How did you test this change?

vercel ci

Are there any deployment considerations?

no

Does this work require review from our design team?

no

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Latest commit: 30b1a53

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