Reformat and update posthog.com licence (#5446)

* Reformat and update posthog.com licence

Swap the sections around, updated to 2023 and corrected a couple of typos

* Update LICENSE

LICENSE

@@ -1,6 +1,17 @@
+# For all content except the /contents/ folder
+
+Copyright (c) 2020-2023 PostHog Inc.
+
+Please do not duplicate, copy, or use our website for commercial or non-
+commercial use. We put have put a lot of effort into a unique design, so we'd be 
+sad if it became non-unique!
+
+We're happy for you to use our logo for the purposes of referencing PostHog, but 
+not for you to pretend to be us.
+
 # For content in the /contents/ folder
 
-Copyright (c) 2020 
+Copyright (c) 2020-2023 PostHog Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -20,10 +31,4 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
-# For the rest of this repository
-
-Copyright (c) 2020
-
-Please do not duplicate, copy or use our website for commercial or non commercial use. We put lots of effort into a unique design so we'd be sad if it become non-unique!
 
-We're happy for you to use our logo for the purposes of referencing PostHog, but not to pretend to be us.