Refactor code by abstracting specific tasks

api/browser_guide/adoc/browser_guide.adoc

api/browser_guide/create_html.sh

api/browser_guide/examplegraph.py

api/browser_guide/html/browser_guide.html

api/browser_guide/templates/block_admonition.html.erb

api/browser_guide/templates/block_audio.html.erb

api/browser_guide/templates/block_colist.html.erb

api/browser_guide/templates/block_dlist.html.erb

api/browser_guide/templates/block_example.html.erb

api/browser_guide/templates/block_floating_title.html.erb

api/browser_guide/templates/block_image.html.erb

api/browser_guide/templates/block_listing.html.erb

api/browser_guide/templates/block_literal.html.erb

api/browser_guide/templates/block_math.html.erb

api/browser_guide/templates/block_olist.html.erb

api/browser_guide/templates/block_open.html.erb

api/browser_guide/templates/block_page_break.html.erb

api/browser_guide/templates/block_paragraph.html.erb

api/browser_guide/templates/block_pass.html.erb

api/browser_guide/templates/block_preamble.html.erb