zic, tzselect: add page

pages/linux/tzselect.md

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+# tzselect
+
+> Interactively select timezone.
+> More information: <https://manned.org/tzselect>.
+
+- Open the interactive menu for timezone selection:
+
+`tzselect`
+
+- Ask for nearest timezone to coordinates in ISO 6709 notation:
+
+`tzselect -c {{coordinates}}`

pages/linux/zic.md

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