Switch to 'make' for running app processes

These are simple enough that they don't need their own scripts.

scripts/run_app.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-set -e
-
-source environment.sh
-flask run -p 6011

scripts/run_celery.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-set -e
-
-source environment.sh
-celery -A run_celery.notify_celery worker --pidfile="/tmp/celery.pid" --loglevel=INFO --concurrency=4

scripts/run_celery_beat.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-set -e
-
-source environment.sh
-celery -A run_celery.notify_celery beat --loglevel=INFO