The reason for the retirement is that the code is not used anymore.
The wall app lets users interact with the corresponding wall smart contract, which stores the messages that are displayed by the app.
A Vue.js project
# install dependencies
npm install
# serve with hot reload at localhost:8080
npm run dev
# build for production with minification
npm run build
# build for production and view the bundle analyzer report
npm run build --report
# run unit tests
npm run unit
# run e2e tests
npm run e2e
# run all tests
npm test
# run smart contract tests
cd contract/ && truffle test
For a detailed explanation on how things work, check out the guide and docs for vue-loader.