I have a multi-site setup. There gonna be three themes. The look the same but they are different in colors. What are best practices to setup my theme structure:
- In themes/custom/site1 and site2 and site3
- Or in sites/site1/themes ?
If they only differ in color, you should provide a theme setting for choosing it and setup the theme in
/themes/custom/mymulticolortheme, so it will become available for all sites. Otherwise you have to maintain multiple nearly identical themes, which is a time killer when you have to fix a bug or add a feature.
If you have different themes for each site you should place each theme in the particular site theme folder like
/sites/site2/themes/custom/mytotalydifferentthemeforsite2 etc., so that they are only available for sites they belong to.