*: remove build-units script

closes #159

Documentation/deploy-guide.md

-# Deploying
-
-Generate systemd unit files by injecting secrets into the unit file templates located in: `./static/...`.
-
-```
-source <path-to-secure>/prod/dex.env.txt
-./build-units
-```
-

build-units

-#!/bin/bash -e
-
-mkdir -p deploy
-
-required=(
-  ${DEX_OVERLORD_DB_URL:?"missing"}
-  ${DEX_OVERLORD_KEY_SECRET:?"missing"}
-  ${DEX_WORKER_DB_URL:?"missing"}
-  ${DEX_WORKER_KEY_SECRET:?"missing"}
-)
-
-eval "cat <<EOF
-$(<static/dex-worker.service.tmpl)
-EOF
-" 1> deploy/dex-worker.service
-
-eval "cat <<EOF
-$(<static/dex-overlord.service.tmpl)
-EOF
-" 1> deploy/dex-overlord.service

static/fixtures/sample.env.txt

-# example env file for local development to source when using build-units
-
 # dex worker
 export DEX_WORKER_KEY_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 export DEX_WORKER_OAUTH_CLIENT_ID=CHANGEME