Update references to point to new repo and remove other redundant ref…

…erences. (corda#3151)

.ci/README.md

@@ -1,7 +1,7 @@
 # !! DO NOT MODIFY THE API FILE IN THIS DIRECTORY !!
 
 The `api-current.txt` file contains a summary of Corda's current public APIs,
-as generated by the `api-scanner` Gradle plugin. (See [here](../gradle-plugins/api-scanner/README.md) for a detailed description of this plugin.) It will be regenerated and the copy in this repository updated by the Release Manager with
+as generated by the `api-scanner` Gradle plugin. (See [here](https://github.com/corda/corda-gradle-plugins/blob/master/api-scanner/README.md) for a detailed description of this plugin.) It will be regenerated and the copy in this repository updated by the Release Manager with
 each new Corda release. It will not be modified otherwise except under special circumstances that will require extra approval.
 
 Deleting or changing the existing Corda APIs listed in `api-current.txt` may

.gitignore

@@ -39,7 +39,6 @@ lib/quasar.jar
 .idea/runConfigurations
 .idea/dictionaries
 .idea/codeStyles/
-/gradle-plugins/.idea/
 
 # Include the -parameters compiler option by default in IntelliJ required for serialization.
 !.idea/compiler.xml
@@ -62,7 +61,6 @@ lib/quasar.jar
 # Gradle:
 # .idea/gradle.xml
 # .idea/libraries
-/gradle-plugins/gradle*
 
 # Mongo Explorer plugin:
 # .idea/mongoSettings.xml

docs/source/corda-repo-layout.rst

@@ -15,7 +15,6 @@ The Corda repository comprises the following folders:
 * **finance** defines a range of elementary contracts (and associated schemas) and protocols, such as abstract fungible
   assets, cash, obligation and commercial paper
 * **gradle** contains the gradle wrapper which you'll use to execute gradle commands
-* **gradle-plugins** contains some additional plugins which we use to deploy Corda nodes
 * **lib** contains some dependencies
 * **node** contains the core code of the Corda node (eg: node driver, node services, messaging, persistence)
 * **node-api** contains data structures shared between the node and the client module, e.g. types sent via RPC