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/tzselect.md

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+# tzselect
+
+> Interactively select timezone.
+> Note: this program doesn't actually set the timezone.
+> More information: <https://manned.org/tzselect>.
+
+- Open the interactive menu for timezone selection and print the selected timezone to `stdout`:
+
+`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 a directory:
+
+`zic -d {{path/to/directory}}`
+
+- Report warnings during compilation of a specific file:
+
+`zic -v {{path/to/file}}.infile`