chore(Dockerfile): Install Pandoc (for R docs) and Node.js 14
chore(Dockerfile): Install Pandoc (for R docs) and Node.js 14

stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila