Rename ops team to infrastructure team

Ambiguity between working group operations and `ops` / `operations` team was raised at the last meeting.
This renames the `ops` team to the `infrastructure` team to remove that ambiguity.

Author: ryankurte

README.md

@@ -227,9 +227,9 @@ Projects maintained by this team
 - [`msp430-rt`]
 - [`msp430`]
 
-### The ops team
+### The infrastructure team
 
-The ops team manages our domains, DNS records, e-mail aliases, etc.
+The infrastructure team manages our domains, DNS records, e-mail aliases, etc.
 
 #### Members