remove 5.3 symlink (#1216)

Author: jeff-allen-mongo

config/redirects

@@ -5,7 +5,6 @@ symlink: manual -> v5.0
 symlink: stable -> v5.0
 symlink: rapid -> v5.2
 symlink: upcoming -> master
-symlink: v5.3 -> master
 
 [v2.2]: ${prefix}/${version}/core/read-operations-introduction -> ${base}/${version}/core/read-operations/
 [v2.2]: ${prefix}/${version}/core/write-operations-introduction -> ${base}/${version}/core/write-operations/