Improve age-restricted hyperlinks, clean up markup, and add navigation icons

package-lock.json

@@ -16,6 +16,7 @@
         "@tailwindcss/typography": "^0.5.14",
         "astro": "^4.13.3",
         "astro-pagefind": "^1.6.0",
+        "clsx": "^2.1.1",
         "github-slugger": "^2.0.0",
         "marked": "^14.0.0",
         "pagefind": "^1.1.0",
@@ -5046,11 +5047,12 @@
       ]
     },
     "node_modules/micromatch": {
-      "version": "4.0.5",
-      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.5.tgz",
-      "integrity": "sha512-DMy+ERcEW2q8Z2Po+WNXuw3c5YaUSFjAO5GsJqfEl7UjvtIuFKO6ZrKvcItdy98dwFI2N1tg3zNIdKaQT+aNdA==",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
+      "integrity": "sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==",
+      "license": "MIT",
       "dependencies": {
-        "braces": "^3.0.2",
+        "braces": "^3.0.3",
         "picomatch": "^2.3.1"
       },
       "engines": {