Improve website performance

- Progressive chunked data loading (newest releases first)
- Loading indicator for partial and full loads
- Pre-render markdown at load time, remove ngx-markdown dependency
- OnPush change detection and trackBy on all components
- Resource hints, non-blocking fonts, PWA service worker
- Fix mobile navbar spacing

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

Author: saschagrunert

angular.json

@@ -21,6 +21,7 @@
             "assets": [
               "src/favicon.png",
               "src/assets",
+              "src/manifest.webmanifest",
               {
                 "glob": "about-modal-content.html",
                 "input": "src/app/main",
@@ -45,6 +46,7 @@
               "outputHashing": "all",
               "sourceMap": false,
               "extractLicenses": true,
+              "serviceWorker": "ngsw-config.json",
               "budgets": [
                 {
                   "type": "initial",

ngsw-config.json

@@ -0,0 +1,32 @@
+{
+  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
+  "index": "/index.html",
+  "assetGroups": [
+    {
+      "name": "app",
+      "installMode": "prefetch",
+      "resources": {
+        "files": ["/favicon.png", "/index.html", "/manifest.webmanifest", "/*.css", "/*.js"]
+      }
+    },
+    {
+      "name": "assets",
+      "installMode": "lazy",
+      "updateMode": "prefetch",
+      "resources": {
+        "files": ["/assets/**", "/*.(svg|cur|jpg|jpeg|png|apng|webp|avif|gif|otf|ttf|woff|woff2)"]
+      }
+    }
+  ],
+  "dataGroups": [
+    {
+      "name": "api-cdn",
+      "urls": ["https://cdn.dl.k8s.io/**"],
+      "cacheConfig": {
+        "maxSize": 200,
+        "maxAge": "1d",
+        "strategy": "freshness"
+      }
+    }
+  ]
+}