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.

tests/data/sites/tags/config.yml

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+name: Tags Test
+template: plain

tests/data/sites/tags/content/no-tags.md

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+---
+type: article
+section: posts
+slug: no-tags
+title: No Tags
+date: 2026-08-28
+---
+No tags.

tests/data/sites/tags/content/one-tag.md

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+---
+type: article
+section: posts
+slug: one-tag
+title: One Tag
+date: 2026-08-28
+tags: [python]
+---
+One tag.

tests/data/sites/tags/content/two-tags.md

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+---
+type: article
+section: posts
+slug: two-tags
+title: Two Tags
+date: 2026-08-28
+tags: [python, testing]
+---
+Two tags.