feat: add option for self-hosting via Docker (#1503)

Dockerfile

@@ -0,0 +1,16 @@
+FROM node:14-alpine AS build
+
+ENV NODE_ENV=production
+WORKDIR /usr/src/app
+
+COPY package.json package-lock.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build:app
+
+FROM nginx:1.17-alpine
+
+COPY --from=build /usr/src/app/build /usr/share/nginx/html
+
+HEALTHCHECK CMD wget -q -O /dev/null http://localhost || exit 1