Ubuntu install script (#289)

* Copy of Zach's install script

* Few small fixes after testing on DO droplet

* Update scripts

* Rename script

* Add sudo notice

* Fix typo

* Fix another typo

* Update docker instructions

Former-commit-id: 9e2b140e10

scripts/developer-mode-setup.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Script to automate the steps needed to make a cloned project repo runnable on the path
+# (beware of PATH having some other file with the same name ahead of ours)
+if [[ -n "$CERC_SCRIPT_DEBUG" ]]; then
+    set -x
+    echo PATH is $PATH
+fi
+python3 -m venv venv
+source ./venv/bin/activate
+pip install --editable .
+pip install shiv