Maybe some “initial configuration” plugin could be created and linked from Obsidian’s download page.
It would
- guide user (via ~ questionnaire) through most frequently requested initial customizations
- produce necessary css snippets
- and also show user where to change it in settings to familiarize him with UI and structure of .obsidian folder and other principles.
- After finishing configuration, the plugin could be optionally trashed.
I did not browse plugin ideas if something like this exists. Feel free to evolve this and publish as a plugin-idea or a plugin.