i18n(de): update `basics/astro-pages.mdx`

[trueberryless]

Description (required)

• update basics/astro-pages.mdx
• #1442
• #1434
• #1510
• #1538
• #1638
• #2091
• #2133
• #2409
• #2371
• no real changes in #2546
• no translation changes from #3042
• #4610
• no translation changes from #4854
• #5128
• #5205
• #5240
• #5364
• #5765
• #6267
• remove paragraph (I cannot find the commit where this change happened in the original locale) (https://github.com/withastro/docs/pull/9759/commits/ca13a0049ad3235853df81fdcc43a39d065dd333)
• #6620
• #8495
• #8573
• #9336
• fix links in guides/rss.mdx and guides/markdown-content.mdx files which lead to this page

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