Tighten lighthouse thresholds (#217)

Author: jarrodmillman

netlify.toml

@@ -10,7 +10,7 @@
 
   # optional, fails build when a category is below a threshold
   [plugins.inputs.thresholds]
-    performance = 0.75
+    performance = 0.85
     accessibility = 0.95
     best-practices = 0.95
     seo = 0.95