Merge pull request #1136 from OpenTechFund/open-call-index-page

opentech/apply/funds/models/applications.py

opentech/apply/funds/models/mixins.py

opentech/apply/funds/templates/funds/application_base.html

opentech/apply/templates/forms/includes/field.html

opentech/public/funds/migrations/0011_opencallindexpage.py

opentech/public/funds/models.py

...ic/funds/templates/public_funds/open_call_index_page.html

opentech/static_src/src/sass/public/components/_grid.scss

opentech/static_src/src/sass/public/components/_listing.scss

...ech/static_src/src/sass/public/components/_rich-text.scss