i18n(de): Translate all files into German

[trueberryless]

What kind of changes does this PR include?

• Changes or translations of Starlight docs site content

Description

• Translate some pages of the docs into German because it was outdated.
• Translate new pages of the docs into German
• Translation for sidebar completed

List of translated pages

updated:

• getting-started.mdx
• index.mdx

new:

• environmental-impact.md
• guides/authoring-content.md
• guides/components.md
• guides/css-and-tailwind.md
• guides/customization.md
• guides/i18n.md
• guides/overriding-components.md
• guides/project-structure.md
• guides/sidebar.md
• reference/configuration.md
• reference/frontmatter.md
• reference/overrides.md
• showcase.md

Link to translation overview: https://i18n.starlight.astro.build/

#hacktoberfest

[changeset-bot]

⚠️ No Changeset found

Latest commit: 600176e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[netlify]

👷 Deploy Preview for astro-starlight processing.

Name	Link
🔨 Latest commit	600176e
🔍 Latest deploy log	https://app.netlify.com/sites/astro-starlight/deploys/653a3909ca47ee0008e94e0c

[trueberryless]

Okay, I gotta admit, I kinda messed up last 4 commits...
Should I just leave them, as they are or is there a possibility to revert them?

[HiDeoo]

Okay, I gotta admit, I kinda messed up last 4 commits...

Do not worry, no problem at all.

When accepting your pull request, all your commits will be squashed into one just like if it was only one commit. So you can just leave them as they are, revert them if your prefer, add more commits, etc. What matters is the final result that will be merged into the main branch so if the content is good, the commits to get there do not really matter.

[trueberryless]

Okay, a few things about the last commit:

• I'm not sure how to translate "Tailwind’s border utility classes" into German (currently it's: "die Grenznutzungsklassen von Tailwind")
• more important: I added some   (forces space) to the preview of the theme-designer because I think it looks better if the sentences have a space after ending dot of the sentence... (I don't know if this design is intentional, but I though I will fix it)

If it is intentional that the preview has no spaces between sentences, I will revert my changes.

[trueberryless]

Muss ich jetzt irgendwo nen Button klicken, damit der Branch gemerged werden könnte, weil er currently blockiert ist?

[trueberryless]

Finally, all files translated (again)! It would be really nice if the PR could count for #Hacktoberfest, but there is probably not enough time to review all files, so I'm not at all disappointed, if the PR is not merged in October...

[delucis]

Wir sind fast da! Hoffentlich schaffen wir das in Oktober noch zu mergen.

[trueberryless]

You love to see it:

[delucis]

LGTM! Thanks for all the hard work keeping this PR updated until it was fully reviewed 💖