docs: add mine placeholders and setup notes

README.md

@@ -8,6 +8,24 @@ Quartz is a set of tools that helps you publish your [digital garden](https://jz
 
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+## MINE
+
+Fill these placeholders before using this branch for your own site:
+
+- `quartz.config.ts`
+  - `pageTitle: "TITLE"`
+  - `baseUrl: "YOUR-DOMAIN.com"`
+- `quartz/i18n/locales/en-US.ts`
+  - `components.explorer.title = "TITLE"`
+- `quartz/components/RuinsFooter.tsx`
+  - replace `FOOTER TEXT`
+- `quartz/components/RuinsDarkmode.tsx`
+  - replace `LIGHT LABEL`
+  - replace `DARK LABEL`
+
+The color palette is intentionally left as-is. `quartz.config.ts` and `quartz/styles/custom.scss`
+also include short comments describing what the custom knobs affect.
+
 ## Sponsors
 
 <p align="center">