Update layout to be a svelte monorepo with shadcn-svelte

Also: add the start of a.starrysky.fyi
diff --git a/packages/components/src/app.postcss b/packages/components/src/app.postcss
new file mode 100644
index 0000000..1a7b7cf
--- /dev/null
+++ b/packages/components/src/app.postcss
@@ -0,0 +1,4 @@
+/* Write your global styles here, in PostCSS syntax */
+@tailwind base;
+@tailwind components;
+@tailwind utilities;