fix: discontinue built-in Forestry support

Netlify CMS is supported instead.

.forestry/front_matter/templates/blog-post.yml

@@ -1,50 +0,0 @@
----
-label: Blog post
-hide_body: false
-fields:
-- type: text
-  name: title
-  label: title
-- type: text
-  name: subtitle
-  label: subtitle
-- type: datetime
-  name: date
-  label: date
-- type: list
-  name: authors
-  label: authors
-- type: list
-  name: tags
-  label: tags
-- type: text
-  name: summary
-  label: summary
-- type: field_group
-  name: image
-  label: image
-  fields:
-  - type: number
-    name: placement
-    label: placement
-  - type: text
-    name: caption
-    label: caption
-  - type: text
-    name: focal_point
-    label: focal_point
-    description: Image Focal Point (Smart, Center, TopLeft, Top, TopRight, Left, Right,
-      BottomLeft, Bottom, BottomRight)
-- name: projects
-  type: list
-  config:
-    use_select: false
-    min: 
-    max: 
-  label: projects
-  description: Associate this content with a project by entering a project folder
-    name
-- name: featured
-  type: boolean
-  label: featured
-  description: You can filter by featured content on your homepage

.forestry/front_matter/templates/event.yml

@@ -1,71 +0,0 @@
----
-label: Event
-hide_body: true
-fields:
-- type: text
-  name: title
-  label: title
-- name: subtitle
-  type: text
-  config:
-    required: false
-  label: subtitle
-- type: text
-  name: event
-  label: event
-  description: Name of the event (e.g. Academic Conference)
-- type: text
-  name: event_url
-  label: Event Link
-- type: text
-  name: location
-  label: location
-- type: datetime
-  name: publishDate
-  label: publishDate
-  description: When to publish this page (choose today)
-- type: datetime
-  name: date
-  label: date
-  description: Start time
-- type: datetime
-  name: date_end
-  label: date_end
-  description: End time
-- type: boolean
-  name: all_day
-  label: all_day
-- type: list
-  name: authors
-  label: Presenters
-- type: textarea
-  name: abstract
-  label: abstract
-- type: text
-  name: url_slides
-  label: url_slides
-- type: text
-  name: url_video
-  label: url_video
-- type: text
-  name: url_code
-  label: url_code
-- type: field_group
-  name: image
-  label: image
-  fields:
-  - type: number
-    name: placement
-    label: placement
-  - type: text
-    name: caption
-    label: caption
-  - type: text
-    name: focal_point
-    label: focal_point
-    description: Image Focal Point (Smart, Center, TopLeft, Top, TopRight, Left, Right,
-      BottomLeft, Bottom, BottomRight)
-- name: featured
-  type: boolean
-  label: featured
-  description: You can filter by featured content on your homepage

.forestry/settings.yml

@@ -1,56 +0,0 @@
----
-new_page_extension: md
-auto_deploy: false
-admin_path:
-webhook_url:
-sections:
-- type: directory
-  path: content/home
-  label: Home
-  create: all
-  match: "**/*"
-- type: directory
-  path: content/post
-  label: Blog posts
-  create: all
-  match: "**/*"
-  templates:
-  - blog-post
-- type: directory
-  path: content/project
-  label: Projects
-  create: all
-  match: "**/*"
-- type: directory
-  path: content/talk
-  label: Events
-  create: all
-  match: "**/*"
-  templates:
-    - event
-- type: directory
-  path: content/publication
-  label: Publications
-  create: all
-  match: "**/*"
-- type: directory
-  path: content
-  label: Pages
-  create: all
-  match: "*"
-upload_dir: static/img
-public_path: "/img"
-front_matter_path: ''
-use_front_matter_path: false
-file_template: ":filename:"
-build:
-  preview_env:
-  - HUGO_ENV=staging
-  - HUGO_VERSION=0.58.2
-  preview_output_directory: public
-  preview_docker_image: forestryio/hugo:latest
-  mount_path: "/srv"
-  working_dir: "/srv"
-  instant_preview_command: hugo server -D -E -F --port 8080 --bind 0.0.0.0 --renderToDisk
-    -d public
-version: 0.58.2