clean readme

src/lib/Counter.svelte

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+<script>
+  let count = 0
+  const increment = () => {
+    count += 1
+  }
+</script>
+
+<button on:click={increment}>
+  count is {count}
+</button>

src/lib/base.svelte

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+<style>
+  @tailwind base;
+  @tailwind components;
+  @tailwind utilities;
+</style>