Add Dockerfile for easy installation on local machine

Dockerfile

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+FROM jekyll/jekyll:4.2.0
+# until release of 4.3 we should ping 4.2.0
+Label MAINTAINER Amir Pourmand
+#install imagemagick tool for convert command
+RUN apk add --no-cache --virtual .build-deps \
+        libxml2-dev \
+        shadow \
+        autoconf \
+        g++ \
+        make
+#    && apk add --no-cache imagemagick-dev imagemagick
+WORKDIR /srv/jekyll
+ADD Gemfile /srv/jekyll/
+ADD lagrange.gemspec /srv/jekyll
+RUN bundle install
+RUN bundle add webrick

docker-compose.yml

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+version: "3"
+
+services:
+  jekyll_custom:
+    build: .
+    command: bash -c "
+      rm -f Gemfile.lock
+      && bundle exec jekyll serve --watch --port=8080 --host=0.0.0.0 --livereload --verbose --trace"
+    ports:
+      - 8080:8080
+    volumes:
+      - .:/srv/jekyll