zic, tzselect: add page (#14312)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/zic.md

@@ -0,0 +1,12 @@
+# zic
+
+> Compile timezones into binary files.
+> More information: <https://manned.org/zic>.
+
+- Compile a timezone file from a directory:
+
+`zic -d {{path/to/directory}}`
+
+- Report warnings during compilation of a specific file:
+
+`zic -v {{path/to/file}}.infile`