remove sonatype credential setting and update docs (#306)

MAINTAINERS.md

@@ -134,12 +134,18 @@ note you will have to generate a strong passphrase and save it in some password
 1. Run `blackbox_cat vinyldns-sonatype.txt.gpg` to view the passphrase for that key - you will need this passphrase handy when releasing
 1. Create a file `~/.sbt/1.0/vinyldns-gpg-credentials` with the content
 
-``` 
-realm=GnuPG Key ID
-host=gpg
-user=vinyldns@gmail.com
-password=ignored-must-use-pinentry
-```
+    ```
+    realm=GnuPG Key ID
+    host=gpg
+    user=vinyldns@gmail.com
+    password=ignored-must-use-pinentry
+    ```
+
+1. Add credenial configuration to global sbt setting in `~/.sbt/1.0/credential.sbt` with the content
+
+    ```
+    credentials += Credentials(Path.userHome / ".sbt" / "1.0" / "vinyldns-gpg-credentials")
+    ```
 
 ## Release Process
 

build.sbt

@@ -261,8 +261,7 @@ lazy val corePublishSettings = Seq(
     Developer(id="mitruly", name="Michael Ly", email="michaeltrulyng@gmail.com", url=url("https://github.com/mitruly")),
     Developer(id="britneywright", name="Britney Wright", email="blw06g@gmail.com", url=url("https://github.com/britneywright")),
   ),
-  sonatypeProfileName := "io.vinyldns",
-  credentials += Credentials(Path.userHome / ".sbt" / "1.0" / "vinyldns-gpg-credentials")
+  sonatypeProfileName := "io.vinyldns"
 )
 
 lazy val core = (project in file("modules/core")).enablePlugins(AutomateHeaderPlugin)