📚 Improve metadata descriptions (#6457)

docs/contributing-guide/coc/index.njk

@@ -1,5 +1,6 @@
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 title: 04· Code of Conduct
+desc: Learn about contributing to the Penpot project! This page outlines the Code of Conduct, reporting bugs, translations, core code contributions, & more.
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 <h1 id="coc">Code of conduct</h1>

docs/contributing-guide/code-contributions/index.njk

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 title: 03· Core code contributions
+desc: Learn how to contribute to Penpot's open-source design collaboration platform. Find guidelines for bug reporting, code contributions & more.
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 <h1 id="code-contributions">Core code contributions</h1>

docs/contributing-guide/index.njk

@@ -1,5 +1,6 @@
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 title: Contributing
+desc: Learn how to contribute to Penpot, the open-source design collaboration platform! Find guides on bug reporting, translations, code contributions, and more.
 eleventyNavigation:
   key: Contributing
   order: 3

docs/contributing-guide/libraries-templates/index.njk

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 title: 05· Libraries & Templates
+desc: Contribute to Penpot's libraries & templates! Learn how to share your files and access resources. Try Penpot - It's free!
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 <h1 id="libraries">Libraries & templates</h1>

docs/contributing-guide/reporting-bugs/index.njk

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 title: 01· Reporting bugs
+desc: Learn how to contribute to Penpot, the open-source design and prototyping platform! Find guidelines for reporting bugs, translations, & code contributions.
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 <h1 id="reporting-bugs">Reporting bugs</h1>

docs/contributing-guide/translations/index.njk

@@ -1,5 +1,6 @@
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 title: 02· Translations
+desc: Contribute to Penpot! Learn how to translate Penpot into your language using Weblate. Add new translations, languages, or edit existing ones today.
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 <h1 id="translations">Translations</h1>