feat: add dockerfile and update readme for docker image building and usage

[alwqx]

1. add dockerfile to build image
2. update readme.md for run docker image

[alwqx]

@XPoet please review this pr, thanks.

[alwqx]

@XPoet Hi, I skipped a few details in readme about build docker image.
If you are in China mainland, you may probably build failed. You'd better change the dockerfile to below:

FROM node:lts-alpine as builder

WORKDIR /app
COPY . .
-RUN npm install --legacy-peer-deps
+RUN npm config set strict-ssl false && npm install --legacy-peer-deps --registry https://mirrors.cloud.tencent.com/npm/
RUN npm run build

FROM nginx:stable-alpine
COPY --from=builder /app/dist /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

npm config set strict-ssl fals for taobao.org certificate has expired

--registry https://mirrors.cloud.tencent.com/npm/ to speed up docker build in mainland