feat: deprecate warning for goerli (#126)

# What ❔

Deprecate warning for Goerli network:
<img width="1279" alt="image"
src="https://github.com/matter-labs/block-explorer/assets/6553665/6f1e0117-3561-4d85-a2a4-dd8fc53b695a">


## Why ❔

To warn users that we are ending support of Goerli testnet.

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [X] PR title corresponds to the body of PR (we generate changelog
entries from PRs).

packages/app/src/App.vue

@@ -3,7 +3,6 @@
     <the-header :class="$route?.name" />
     <div class="container-app">
       <NetworkDeprecated v-if="!currentNetwork.maintenance && currentNetwork.name === 'goerli'" />
-      <IndexerDelayAlert v-if="!currentNetwork.maintenance && currentNetwork.name === 'mainnet'" />
       <MaintenanceView v-if="currentNetwork.maintenance" />
       <router-view v-else />
     </div>
@@ -14,7 +13,6 @@
 <script setup lang="ts">
 import { useTitle } from "@vueuse/core";
 
-import IndexerDelayAlert from "@/components/IndexerDelayAlert.vue";
 import NetworkDeprecated from "@/components/NetworkDeprecated.vue";
 import TheFooter from "@/components/TheFooter.vue";
 import TheHeader from "@/components/header/TheHeader.vue";

packages/app/src/components/NetworkDeprecated.vue

@@ -1,23 +1,31 @@
 <template v-if="newNetworkUrl">
-  <SystemAlert>
+  <div class="deprecated-alert">
+    <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+      <path
+        d="M21.0907 18.7005C20.8457 19.1905 20.3449 19.5 19.7971 19.5H4.20288C3.65506 19.5 3.15426 19.1905 2.90927 18.7005C2.69455 18.2711 2.70694 17.7631 2.94232 17.3446L10.9455 3.11671C11.1598 2.73575 11.5629 2.5 12 2.5C12.4371 2.5 12.8402 2.73575 13.0545 3.11671L21.0577 17.3446C21.2931 17.7631 21.3054 18.2711 21.0907 18.7005Z"
+        stroke="#FFC81A"
+      />
+      <circle cx="12" cy="16" r="1" fill="#FFC81A" />
+      <path d="M12 14V6" stroke="#FFC81A" />
+    </svg>
     <span
       >We are ending our support of Goerli testnet. Please <a :href="newNetworkUrl!">use Sepolia</a>. For more info see
-      <a target="_blank" href="https://github.com/zkSync-Community-Hub/zksync-developers/discussions/228"
+      <a target="_blank" href="https://github.com/zkSync-Community-Hub/zkync-developers/discussions/228"
         >this announcement</a
       >.</span
     >
-  </SystemAlert>
+  </div>
 </template>
 
 <script lang="ts" setup>
 import { computed } from "vue";
-
-import SystemAlert from "@/components/common/SystemAlert.vue";
+import { useRoute } from "vue-router";
 
 import useContext from "@/composables/useContext";
 
 import { getWindowLocation } from "@/utils/helpers";
 
+const route = useRoute();
 const { networks } = useContext();
 
 const newNetworkUrl = computed(() => {
@@ -26,6 +34,7 @@ const newNetworkUrl = computed(() => {
     const { hostname, origin } = getWindowLocation();
 
     if (hostname === "localhost" || hostname.endsWith("web.app") || !network.hostnames?.length) {
+      console.log(route);
       return `${origin}?network=${network.name}`;
     }
     return network.hostnames[0];
@@ -35,7 +44,15 @@ const newNetworkUrl = computed(() => {
 </script>
 
 <style scoped lang="scss">
-a {
-  @apply text-inherit;
+.deprecated-alert {
+  @apply flex text-white rounded-2xl border border-amber-400/50 bg-amber-400/10 mb-6 py-3 px-4;
+
+  svg {
+    @apply mr-2;
+  }
+
+  a {
+    @apply text-inherit;
+  }
 }
 </style>