add pre_deploy.sh script for dotter

.dotter/handlebars_helpers/header.rhai

@@ -0,0 +1,48 @@
+let x_padding = hash["padding"] ?? 50;
+
+let header = #{
+  x_padding: x_padding,
+  out: "",
+  append: |suffix| {
+    this.out += suffix + "\n";
+  },
+  append_center: |suffix| {
+
+    let suffix_len = suffix.len();
+    let padding = this.x_padding - suffix_len / 2;
+    let fill = "";
+    fill.pad(padding, " ");
+
+    this.out += fill + suffix.to_upper() + fill + "\n";
+  },
+  append_divider: || {
+    let divider = "";
+    divider.pad(this.x_padding * 2, "─");
+
+    this.append(divider);
+  },
+  open_echo: || {
+    this.out += "echo -e '\n";
+  },
+  close_echo: || {
+    this.out += "'";
+  },
+  to_string: || {
+    return this.out;
+  }
+};
+
+header.open_echo();
+
+header.append_divider();
+
+
+params.for_each(|idx| {
+  header.append_center(this);
+});
+
+header.append_divider();
+header.close_echo();
+
+return header.to_string();
+