Add ahoy and docker environment

.ahoy.yml

+ahoyapi: v2
+commands:
+  mkdocs:
+    imports:
+      - ahoy.mkdocs.yml
+    usage: MkDocs tools.
+  changelog:
+    imports:
+      - ./.ahoy.l3d/changelog.yml
+    usage: Changelog tools.

.gitignore

 /site/
+/.ahoy.l3d
+/.env

ahoy.mkdocs.yml

+ahoyapi: v2
+commands:
+  up:
+    cmd: |
+      d-c up -d
+      echo "Open site in browser: http://127.0.0.1:8999"
+    usage: Start MkDocs server.
+  down:
+    cmd: d-c down
+    usage: Stop MkDocs server.
+  build:
+    cmd: d-c exec --workdir=/mkdocs mkdocs mkdocs build
+    usage: Stop MkDocs server.

docker-compose.yml

+version: '3.7'
+
+services:
+  mkdocs:
+    container_name: mkdocs
+    image: polinux/mkdocs:1.1.2
+    restart: always
+    ports:
+      - 8999:8000
+    environment:
+      LIVE_RELOAD_SUPPORT: 'true'
+      ADD_MODULES: fontawesome-markdown mkdocs-git-revision-date-localized-plugin mkdocs-material
+      FAST_MODE: 'true'
+      DOCS_DIRECTORY: /mkdocs
+    volumes:
+      - ${WORKDIR}:/mkdocs