fix(deps): update dependency tailwindcss to v3 (#70)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gatsby/package.json

@@ -26,7 +26,7 @@
     "react-helmet": "^6.1.0",
     "react-icons": "^4.2.0",
     "react-youtube": "^7.13.1",
-    "tailwindcss": "^2.0.3"
+    "tailwindcss": "^3.0.0"
   },
   "devDependencies": {
     "prettier": "2.3.2"