Merge branch '6.0' into upgrade-to-61

Author: stevepiercy

docs/glossary.md

@@ -736,4 +736,8 @@ lazy loading
 lazy loaded
     Lazy loading is a strategy to identify resources as non-blocking (non-critical) and load these only when needed.
     It's a way to shorten the length of the [critical rendering path](https://developer.mozilla.org/en-US/docs/Web/Performance/Critical_rendering_path, which translates into reduced page load times.
+
+reference implementation
+    A reference implementation is a program that implements all requirements from a corresponding specification.
+    The reference implementation often accompanies a technical standard, and demonstrates what should be considered the "correct" behavior of any other implementation of it.
 ```

netlify.toml

@@ -2,5 +2,5 @@
   PYTHON_VERSION = "3.8"
 [[headers]]
   for = "/*"
-  [[headers.values]]
+  [headers.values]
     X-Robots-Tag = "none"