Add archetypes folder for website

[LizzyParkerPannell]

• [x] create an archetypes folder
• [ ] create archetypes/chapter.md file and fill with:

  
  +++
  title = "{{ replace .Name "-" " " | title }}"
  date = {{ .Date }}
  weight = 5
  chapter = true
  pre = "<b>X. </b>"
  +++

Some Chapter title

Lorem Ipsum.

- [x] create `archetypes/default.md` file and fill with:

+++ title = "{{ replace .Name "-" " " | title }}" date = {{ .Date }} weight = 5 +++

Lorem Ipsum.