Remove deprecated stack files

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

stack.yml

-provider:
-  name: openfaas
-  gateway: http://127.0.0.1:8080  # can be a remote server
-
-functions:
-  # Pass a username as an argument to find how many images user has pushed to Docker Hub.
-  hubstats:
-    lang: dockerfile
-    image: functions/hubstats:latest
-    skip_build: true
-
-  # Node.js gives OS info about the node (Host)
-  nodeinfo:
-    lang: dockerfile
-    image: functions/nodeinfo:latest
-    skip_build: true
-
-  # Uses `cat` to echo back response, fastest function to execute.
-  echoit:
-    lang: dockerfile
-    image: functions/alpine:latest
-    fprocess: "cat"
-    skip_build: true
-
-  # Counts words in request with `wc` utility
-  wordcount:
-    lang: dockerfile
-    image: functions/alpine:latest
-    fprocess: "wc"
-    skip_build: true
-
-  # Calculates base64 representation of request body.
-  base64:
-    lang: dockerfile
-    image: functions/alpine:latest
-    fprocess: "base64"
-    skip_build: true
-
-  # Converts body in (markdown format) -> (html)
-  markdown:
-    lang: dockerfile
-    image: functions/markdown-render:latest
-    skip_build: true

stack_arm.yml

-provider:
-  name: openfaas
-  gateway: http://127.0.0.1:8080  # can be a remote server
-
-# sample functions go here, but can be created in the UI too.
-functions:
-  nodeinfo:
-    lang: dockerfile
-    image: functions/nodeinfo:latest-armhf
-
-  markdown:
-    lang: dockerfile
-    image: functions/markdownrender:latest-armhf
-
-  wordcount:
-    image: functions/alpine:latest-armhf
-    fprocess: "wc"
-
-  echoit:
-    lang: dockerfile
-    image: functions/alpine:latest-armhf
-    fprocess: "cat"