remove DB and RD

Datalore and Rider are not supported with gateway yet.

jetbrains-gateway/README.md

@@ -17,7 +17,7 @@ module "jetbrains_gateway" {
   agent_id       = coder_agent.example.id
   agent_name     = "example"
   folder         = "/home/coder/example"
-  jetbrains_ides = ["GO", "WS", "IU", "PY", "PS", "CL", "RM", "DB", "RD"]
+  jetbrains_ides = ["GO", "WS", "IU", "PY", "PS", "CL", "RM"]
   default        = "PY"
 }
 ```
@@ -50,5 +50,3 @@ This module and JetBrains Gateway support the following JetBrains IDEs:
 - PhpStorm (`PS`)
 - CLion (`CL`)
 - RubyMine (`RM`)
-- DataGrip (`DB`)
-- Rider (`RD`)