feat(user/mw_create_redirect_day_month): Create mediawiki script

- Note: Script generates a text file for each day of a specified year
containing redirect wikicode used to link to each day's month's
page. I made this for my personal mediawiki journal so I can wikilink
to iso-8601 dates (e.g. 2022-09-02) and get the corresponding month's
page (e.g. 2022-09) instead (jumping to the section with the iso-8601
date).