message: fix(mkdocs): removed unused packages from container
diff: FROM python:3.7.7-alpine3.12
  -RUN apk update && apk --no-cache add gcc musl-dev graphviz git
  +RUN apk update && apk --no-cache add gcc musl-dev
  RUN pip install --upgrade pip && pip install mkdocs==1.1.2 mkdocs-material==5.3.2 pymdown-extensions==7.1
  ADD ./techdocs-core /techdocs-core
  