Add new examples to kompose (#1803)

#### What type of PR is this?

<!--
Add one of the following kinds:
/kind bug
/kind documentation
/kind feature
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/kind cleanup

#### What this PR does / why we need it:

Fixes the current broken examples by:

* Removing all the old incompatible ones (we do not really support v3
  anymore or v2... since switching libraries)
* Uses quay.io/kompose/web as our front end example which is a fork of
  the guestbook-go kubernetes examples

#### Which issue(s) this PR fixes:
<!--
*Automatically closes linked issue when PR is merged.
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
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Closes https://github.com/kubernetes/kompose/issues/1757

#### Special notes for your reviewer:

Test using docker-compose (you'll see it come up!), then try with
kompose :)

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

examples/web/compose.yaml

@@ -0,0 +1,20 @@
+services:
+
+  redis-leader:
+    container_name: redis-leader
+    image: redis
+    ports:
+      - "6379"
+
+  redis-replica:
+    container_name: redis-replica
+    image: redis
+    ports:
+      - "6379"
+    command: redis-server --replicaof redis-leader 6379
+
+  web:
+    container_name: web
+    build: ./web
+    ports:
+      - "8080:8080"