Remove the scriptz submodule and hard-commit the files.

The submodule is a leftover from when this project was intended to work
as a series of microservices. It was meant to provide common
functionality to the builds for every microservice. That's no longer the
case, and the submodule is a pain-point both in on-boarding new
developers and running the Docker build.

script/include/README.md

@@ -0,0 +1,60 @@
+# scriptz
+
+These script fragments are shared between all of the ATAT applications, powering
+their /script files. See 
+[Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all) 
+and an ATAT application repository for details.
+
+- `global_header.inc.sh`: Run by all /script files at the start of the script.
+- `helper_functions.inc.sh`: Contains general helper functions; sourced by 
+global_header.inc.sh
+- `run_setup`: Main logic run by most /script/setup scripts, after they set any
+relevant environment variables. Initializes the local environment to run the app.
+- `run_bootstrap`: Main logic run by most /script/bootstrap scripts, after they set 
+any relevant environment variables. Installs application dependencies.
+- `run_test`: Main logic run by most /script/test scripts, after they set any
+relevant environment variables. Executes lint, static analysis, and unit tests.
+- `run_update`: Main logic run by most /script/update scripts, after they set any
+ relevant environment variables. Executes application dependency updates, and
+ potentially DB migrations.
+- `run_dev_server`: Main logic run by most /script/dev_server scripts, after any
+ relevant environment variables are set. Launches an application server in DEBUG
+ mode in the background.
+- `run_alpine_setup`: Main logic run by most /script/alpine_setup scripts, after 
+they set any relevant environment variables. Adds Alpine Linux specific system 
+dependencies required to run the app (used by Docker builds).
+- `setup_functions.inc.sh`: Sourced by run_setup; contains setup specific 
+functions.
+- `bootstrap_functions.inc.sh`: Sourced by run_bootstrap; contains bootstrap 
+specific functions.
+- `test_functions.inc.sh`: Sourced by run_test; contains test specific 
+functions.
+- `update_functions.inc.sh`: Sourced by run_update; contains update specific
+ functions.
+- `dev_server_functions.inc.sh`: Sourced by run_dev_server; contains dev_server
+ specific functions.
+- `alpine_setup_functions.inc.sh`: Sourced by run_alpine_setup; contains 
+alpine_setup specific functions.
+
+## Requirements
+
+- **[Python 3.6](https://www.python.org/downloads/)**
+- **[Pipenv](https://docs.pipenv.org/install/#installing-pipenv)**
+
+**Note:** None of these script fragments are designed to be run by themselves. 
+They should be sourced by the relevant bash script in an application's /script 
+directory.
+
+#### Ubuntu 18.04 Instructions
+
+Install pip:
+```
+sudo apt install python3-distutils
+curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+python3 get-pip.py --user
+```
+
+Install pipenv:
+```
+pip install --user pipenv
+```