move the android secrets files in proximity to where they're used

android/.gitignore

@@ -1,7 +1,7 @@
 # Using Android gitignore template: https://github.com/github/gitignore/blob/HEAD/Android.gitignore
 
-gradle.properties.secrets
-time-safari-upload-key-pkcs12.jks
+app/gradle.properties.secrets
+app/time-safari-upload-key-pkcs12.jks
 
 # Built application files
 *.apk

android/app/build.gradle

@@ -1,10 +1,10 @@
 apply plugin: 'com.android.application'
 
-// Default values for signing properties
-project.ext.MY_KEYSTORE_FILE = ""
-project.ext.MY_KEYSTORE_PASSWORD = ""
-project.ext.MY_KEY_ALIAS = ""
-project.ext.MY_KEY_PASSWORD = ""
+// These are sample values to set in gradle.properties.secrets
+// MY_KEYSTORE_FILE=time-safari-upload-key-pkcs12.jks
+// MY_KEYSTORE_PASSWORD=...
+// MY_KEY_ALIAS=time-safari-key-alias
+// MY_KEY_PASSWORD=...
 
 // Try to load from environment variables first
 project.ext.MY_KEYSTORE_FILE = System.getenv('ANDROID_KEYSTORE_FILE') ?: ""