geokret help shortcuts (dedicated subdomains)

[boly38]

Provide short url to access geokret help:

• [en] https://help.geokrety.org
• [fr] https://aide.geokrety.org

Indirect advantage: reference this help url on geokret templates

[boly38]

Way to update geokret templates

• legacy download page is: https://geokrety.org/download.php
• this page references static content from: https://github.com/geokrety/GeoKrety-Static/tree/master/content/images/labels
• labels files are generated from: https://github.com/geokrety/geokrety-website/tree/master/templates/labels