Build v0 example and SSE slices

examples/v0/templates/auth.heml

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+<section data-slhx-root="auth">
+  <form data-slhx-handle="login" data-slhx-form="credentials">
+    <input name="email" type="email" autocomplete="username">
+    <input name="password" type="password" autocomplete="current-password">
+    <button type="submit">Sign in</button>
+  </form>
+  <p data-slhx-slot="login_status">Signed out</p>
+</section>

examples/v0/templates/counter.heml

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+<section data-slhx-root="counter">
+  <output data-slhx-slot="counter_value">0</output>
+  <button type="button" data-slhx-handle="increment">+</button>
+</section>

examples/v0/templates/page_swap.heml

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+<main data-slhx-root="docs">
+  <nav data-slhx-slot="nav">
+    <a href="/docs" data-slhx-nav="" data-slhx-handle="load_docs">Docs</a>
+  </nav>
+  <article data-slhx-slot="content">Welcome</article>
+  <title data-slhx-slot="title">Welcome</title>
+</main>

examples/v0/templates/todos.heml

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+<section data-slhx-root="todos">
+  <form data-slhx-handle="add_todo" data-slhx-form="new_todo">
+    <input name="title" required="required">
+    <button type="submit">Add</button>
+  </form>
+  <ul data-slhx-slot="todo_list">
+    <template h-for="todo in &self.todos" h-key="todo.id">
+      <li data-slhx-slot="todo_row">{+ todo.title +}</li>
+    </template>
+  </ul>
+</section>

examples/v0/templates/wizard.heml

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+<section data-slhx-root="wizard">
+  <form data-slhx-handle="next_step" data-slhx-form="wizard_input">
+    <div data-slhx-slot="wizard_step">Step 1</div>
+    <button type="submit">Next</button>
+  </form>
+</section>