zathura: add page (#6441)

pages/linux/zathura.md

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+# zathura
+
+> A vim-like modal document viewer, with an integrated command line.
+> Make sure a backend is installed (poppler, PostScript or DjVu).
+> More information: <https://pwmt.org/projects/zathura/>.
+
+- Open a file:
+
+`zathura {{path/to/file}}`
+
+- Navigate left/up/down/right:
+
+`<H|J|K|L> or arrow keys`
+
+- Rotate:
+
+`r`
+
+- Invert Colors:
+
+`Ctrl + R`
+
+- Search for text by a given string:
+
+`/{{string}}`
+
+- Create/delete bookmarks:
+
+`:{{bmark|bdelete}} {{bookmark_name}}`
+
+- List bookmarks:
+
+`:blist`