[#8] Adds splash screen, instructions overlay, technology foundation

PR #8
Issue #1, #2, #6, #8

✔️ **All tests passing!**

- adds inital splash screen on load both in browser and in PWA from
  phone's start screen.
- adds splash animation inline in index.html awaiting App component
- adds proper TypeScrip formatting
- adds linting
- generates icons and splash with pwa-assets-generator
- adds delay to mount if time since navStart>2000
- configures splash delay to only delay in prod
- aligns ios splash with loader ani
- adds vuetify material design and get instructions graphic
- adds vuetify svg icons as well as font icons
- configures vuetify to use mdiSvg
- configures vuetify to make custom properties available for css
- updates Home to use vuetify for layout
- moves push to s3 script into packages.json scripts section
- gets eslint in vscode working (see .eslinrc.js)
- adds html overflow-y auto to index to avoid scroll bar when NOT on
mobile
- adds functional navigation bar
- adds typescript shims for handling svg files as objects
- updates @vue/cli and plugins to latest
- adds yarn versioning and local yarn
- adds workspace cfg and starts trigger on instructions button
- adds amplify cfg at root

All tests passing!

README.md

@@ -2,7 +2,55 @@
 
 A mobile-first literacy webapp for adult Chinese.
 
-* [TODO](wiki/TODO.md)
-* [Infrastructure](wiki/infrastructure.md)
-* [Resources](wiki/resources.md)
-* [Setup](wiki/setup.md)
+## Development
+
+```sh
+# Install git
+sudo apt install git
+
+# Clone this git repo
+git clone git@github.com:toshify/shizi.git target-dir
+
+# Install [NVM](https://github.com/nvm-sh/nvm) to handle node versions (ensure v#.##.# is latest version):
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
+
+# Reload terminal
+exit
+Ctrl-Alt-T
+# or instead
+source ~/.bashrc
+
+# Then install latest Node LTS
+nvm install --lts
+
+# Install [yarn](https://yarnpkg.com/getting-started/install) globally
+npm install -g yarn
+
+# Navigate to repo
+cd shizi/vue # or target-dir/vue or target-dir/react
+
+# Install packages
+yarn # equivalent of: yarn install
+
+# Start the app in local demo
+yarn start
+```
+
+## Update tools
+
+### NVM
+Re-install [NVM](https://github.com/nvm-sh/nvm) to update (ensure v#.##.# is latest version):
+```sh
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
+```
+
+### Node
+```sh
+nvm install --lts
+```
+
+### Yarn
+```sh
+yarn set version latest
+```
+