feat(new tool): Markdown to HTML (#916)

* feat(new tool): Markdown to HTML

Fix partially #538

* feat: add print button

* Update src/tools/markdown-to-html/index.ts

* Update src/tools/markdown-to-html/markdown-to-html.vue

---------

Co-authored-by: Corentin THOMASSET <corentin.thomasset74@gmail.com>

src/tools/markdown-to-html/markdown-to-html.vue

@@ -0,0 +1,44 @@
+<script setup lang="ts">
+import markdownit from 'markdown-it';
+import TextareaCopyable from '@/components/TextareaCopyable.vue';
+
+const inputMarkdown = ref('');
+const outputHtml = computed(() => {
+  const md = markdownit();
+  return md.render(inputMarkdown.value);
+});
+
+function printHtml() {
+  const w = window.open();
+  if (w === null) {
+    return;
+  }
+  w.document.body.innerHTML = outputHtml.value;
+  w.print();
+}
+</script>
+
+<template>
+  <div>
+    <c-input-text
+      v-model:value="inputMarkdown"
+      multiline raw-text
+      placeholder="Your Markdown content..."
+      rows="8"
+      autofocus
+      label="Your Markdown to convert:"
+    />
+
+    <n-divider />
+
+    <n-form-item label="Output HTML:">
+      <TextareaCopyable :value="outputHtml" :word-wrap="true" language="html" />
+    </n-form-item>
+
+    <div flex justify-center>
+      <n-button @click="printHtml">
+        Print as PDF
+      </n-button>
+    </div>
+  </div>
+</template>