Refactor whoogle.env -> whoogle.template.env

Renamed to avoid collision issues for users who update the env file when
running their instance.

Non-template env file is gitignored to avoid accidental tracking.

Fixes #467

.gitignore

@@ -15,3 +15,6 @@ app/static/bangs
 /build/
 dist/
 *.egg-info/
+
+# env
+whoogle.env

whoogle.template.env

@@ -1,3 +1,6 @@
+# ----------------------------------
+# Rename to "whoogle.env" before use
+# ----------------------------------
 # You can set Whoogle environment variables here, but must
 # modify your deployment to enable these values:
 #  - Local: Set WHOOGLE_DOTENV=1