feat: add install handler and related logic

- Mako is now a core dependency
- therefore no more 'email' extra
- add `get_install_handler()` method for app handler
- add `render_mako_template()` method for app handler
- add `resource_path()` method for app handler
- install handler thus far can:
  - confirm db connection
  - make appdir plus config/scripts:
    - wutta.conf
    - web.conf
    - upgrade.sh
  - upgrade db schema to create tables
  - from there web app can run, create admin user
- quick start docs now describe "generated code" option

docs/api/wuttjamaican/index.rst

@@ -26,6 +26,7 @@
    email.message
    enum
    exc
+   install
    people
    progress
    testing

docs/api/wuttjamaican/install.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.install``
+========================
+
+.. automodule:: wuttjamaican.install
+   :members: