Expand test Site tests

tests/data/sites/sections/config.yml

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+name: Sections Test
+template: plain

tests/data/sites/sections/content/first-note.md

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+---
+type: article
+section: notes
+slug: first-note
+title: First Note
+date: 2026-08-28
+---
+First note.

tests/data/sites/sections/content/first-post.md

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+---
+type: article
+section: posts
+slug: first-post
+title: First Post
+date: 2026-08-28
+---
+First post.

tests/data/sites/sections/content/second-post.md

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+---
+type: article
+section: posts
+slug: second-post
+title: Second Post
+date: 2026-08-28
+---
+Second post.