Add Windows save instructions UI and fix URL #296

- Add Windows instruction dialog when saving scripts for Windows.
- Fix incorrect macOS download URL given for Linux instructions.
- Refactor UI rendering, eleminating the use of `v-html` and JavaScript
  variables to hold HTML code.

src/presentation/components/Code/CodeButtons/Save/RunInstructions/Steps/InstructionStep.vue

@@ -0,0 +1,19 @@
+<template>
+  <li class="step">
+    <slot />
+  </li>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+
+export default defineComponent({
+  name: 'InstructionSteps', // Define component name for empty component for Vue build and ESLint compatibility.
+});
+</script>
+
+<style scoped lang="scss">
+.step {
+  margin: 10px 0;
+}
+</style>