change error template wording and links

add atom feed

add pygments code block syntax highlighting

fix wording

update wording on methodology page

change markdown library to markdown-it-python and add Graphviz support

change images to be assets and allow for more file types per #25

add new homepage content update page

update landing page links for links to sourcehut

update footer to include source code link

fix landing page link

update footer to include link to docs site

Initial commit from GitHub