Restore programmatic content

[sanscontext]

Previously, all docs that didn't have the rewrite: true flag got the {% include content/integration-foot.md %} content added automatically.

In the new structure we want to opt in to using the content, so we need to check the old site-docs repo, generate a list of files that don't have rewrite: true, and add that include manually to each of them.

[sanscontext]

The To Do list:

aboardly
adtriba
adwords
adwords-remarketing-lists
akita
all-aboard
amazon-s3
appcues
apteligent
batch
boomtrain
branch-metrics
bronto
bugsnag
callexa
castle
chameleon
chartbeat
clevertap
clientsuccess
comscore
convertro
cordialio
countly
criteo
cubitic
curebit
cxense
doubleclick-floodlight
drip
eloqua
errorception
extole
facebook-pixel-server-side
firebase
framed.io
freshdesk
freshsales
friendbuy
frontleaf
gauges
google-adwords-new
google-analytics
google-cloud-pubsub
google-cloud-storage
gosquared
hindsight
hittail
hull
impact-radius
infinario
insidevault
intellimize
iron.io
iterable
kahuna
keen-io
kenshoo-infinity
knowtify
leadboxer
librato
linkedin-conversion-tag
linkedin-insight-tag
livechat
localytics
lytics
madkudu
mailjet
marketo
marketo-v2
millennial-media
moengage
monetate
moosend
nanigans
nielsen-dcr
nudgespot
olark
omniture
onesignal
optimizely-full-stack
optimizely-web
outbound
pardot
perimeterx
personas-facebook-ads
pingdom
pinterest-tag
piwik
planhat
pointillist
postgres
preact
primer
promoter.io
quantcast
ramen
relay
repeater
responsys
rollbar
route
saasquatch
sailthru
salesforce
salesforce-live-agent
salesforce-marketing-cloud
salesmachine
satismeter
seg
selligent
sendwithus
shareasale
smyte
sparkpage
stripe-radar
swrve
tableau
taplytics
tealium-audience-stream
totango
track-js
tractionboard
tray.io
treasure-data
twitter-ads
urban-airship
userengage
vero
watsi
webengage
whale-alerts
wishpond
woopra
youbora
zaius