refactor: remove obsolete pages

src/arabic.md

----
-home: false
-title: Arabic
-layout: Edition
----
-<iframe
-  src="https://ahikar.sub.uni-goettingen.de/arabic-karshuni/"
-  style="width: 100%; height: 81vh;">
-</iframe>

src/de/arabisch.md

----
-home: false
-title: Arabisch
-layout: Layout
----
-
-# {{ $frontmatter.title }}{.text-h1 .mt-4 .mb-6 .font-weight-light .primary--text}
-
-Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut. Lorem ipsum dolor sit amut.

src/syriac.md

----
-home: false
-title: Syriac
-layout: Edition
----
-<iframe
-  src="https://ahikar.sub.uni-goettingen.de/syriac/"
-  style="width: 100%; height: 81vh;">
-</iframe>