feat: add gradient(monochrome, duotone), outline colored button. prefix and suffix slots button

docs/guide/button/examples/ButtonColorExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button color="default">Default</Button>
+    <Button color="alternative">Alternative</Button>
+    <Button color="dark">Dark</Button>
+    <Button color="light">Light</Button>
+    <Button color="green">Green</Button>
+    <Button color="red">Red</Button>
+    <Button color="yellow">Yellow</Button>
+    <Button color="purple">Purple</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonGradientDuotoneExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button gradient="purple-blue">Purple to blue</Button>
+    <Button gradient="cyan-blue">Cyan to blue</Button>
+    <Button gradient="green-blue">Green to blue</Button>
+    <Button gradient="purple-pink">Purple to pink</Button>
+    <Button gradient="pink-orange">Pink to orange</Button>
+    <Button gradient="teal-lime">Teal to lime</Button>
+    <Button gradient="red-yellow">Red to yellow</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonGradientMonochromeExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button gradient="blue">Blue</Button>
+    <Button gradient="cyan">Cyan</Button>
+    <Button gradient="green">Green</Button>
+    <Button gradient="lime">Lime</Button>
+    <Button gradient="pink">Pink</Button>
+    <Button gradient="purple">Purple</Button>
+    <Button gradient="red">Red</Button>
+    <Button gradient="teal">Teal</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonOutlineColorExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button color="default" outline>Default</Button>
+    <Button color="dark" outline>Dark</Button>
+    <Button color="green" outline>Green</Button>
+    <Button color="red" outline>Red</Button>
+    <Button color="yellow" outline>Yellow</Button>
+    <Button color="purple" outline>Purple</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonPillExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button color="default" pill>Default</Button>
+    <Button color="alternative" pill>Alternative</Button>
+    <Button color="dark" pill>Dark</Button>
+    <Button color="light" pill>Light</Button>
+    <Button color="green" pill>Green</Button>
+    <Button color="red" pill>Red</Button>
+    <Button color="yellow" pill>Yellow</Button>
+    <Button color="purple" pill>Purple</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonPrefixExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button color="default">
+      <template #prefix>
+        <svg class="w-5 h-5 mr-2 -ml-1" fill="currentColor" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><path d="M3 1a1 1 0 000 2h1.22l.305 1.222a.997.997 0 00.01.042l1.358 5.43-.893.892C3.74 11.846 4.632 14 6.414 14H15a1 1 0 000-2H6.414l1-1H14a1 1 0 00.894-.553l3-6A1 1 0 0017 3H6.28l-.31-1.243A1 1 0 005 1H3zM16 16.5a1.5 1.5 0 11-3 0 1.5 1.5 0 013 0zM6.5 18a1.5 1.5 0 100-3 1.5 1.5 0 000 3z"></path></svg>
+      </template>
+      Buy
+    </Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonSizeExample.vue

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+<template>
+  <div class="inline-flex items-center gap-2 flex-wrap">
+    <Button size="xs">Extra small - xs</Button>
+    <Button size="sm">Small - sm</Button>
+    <Button size="md">Medium - md</Button>
+    <Button size="lg">Large - lg</Button>
+    <Button size="xl">Extra Large - xl</Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>

docs/guide/button/examples/ButtonSuffixExample.vue

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+<template>
+  <div class="inline-flex align-center gap-2 flex-wrap">
+    <Button color="default">
+      Choose plan
+      <template #suffix>
+        <svg class="w-5 h-5 ml-2 -mr-1" fill="currentColor" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" d="M10.293 3.293a1 1 0 011.414 0l6 6a1 1 0 010 1.414l-6 6a1 1 0 01-1.414-1.414L14.586 11H3a1 1 0 110-2h11.586l-4.293-4.293a1 1 0 010-1.414z" clip-rule="evenodd"></path></svg>
+      </template>
+    </Button>
+  </div>
+</template>
+<script setup>
+import { Button } from '../../../../src/index'
+</script>