Add announcement banner to show updates or important information (#350)

* Add contrast color

* Add crypto-js for md5 hash

* Add announcement banner

tailwind.config.ts

@@ -27,7 +27,6 @@ const config: Config = {
           "940": "#1b1f22",
           "950": "#181a1d",
         },
-
         netbird: {
           DEFAULT: "#f68330",
           "50": "#fff6ed",
@@ -42,6 +41,20 @@ const config: Config = {
           "900": "#7a2b14",
           "950": "#421308",
         },
+        "nb-blue": {
+          DEFAULT: "#31e4f5",
+          "50": "#ebffff",
+          "100": "#cefdff",
+          "200": "#a2f9ff",
+          "300": "#63f2fd",
+          "400": "#31e4f5",
+          "500": "#00c4da",
+          "600": "#039cb7",
+          "700": "#0a7c94",
+          "800": "#126478",
+          "900": "#145365",
+          "950": "#063746",
+        },
       },
       keyframes: {
         "accordion-down": {