Make flags additive and clean up docs

This means that you have to turn on features now instead of disabling
them like auth and https.

In addition:
- Allow multiple options for auth (only password for now).
- Combine the install docs since they had many commonalities and
- generally simplified them (hopefully not too much).
- Move all example configs into docs/examples.

doc/examples/kubernetes.yaml

@@ -0,0 +1,43 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: code-server
+---
+apiVersion: v1
+kind: Service
+metadata:
+ name: code-server
+ namespace: code-server
+spec:
+ ports:
+ - port: 8443
+   name: https
+   protocol: TCP
+ selector:
+   app: code-server
+ type: ClusterIP
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    app: code-server
+  name: code-server
+  namespace: code-server
+spec:
+  selector:
+    matchLabels:
+      app: code-server
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: code-server
+    spec:
+      containers:
+      - image: codercom/code-server
+        imagePullPolicy: Always
+        name: code-server
+        ports:
+        - containerPort: 8443
+          name: https