add DEVELOPMENT.md

DEVELOPMENT.md

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+Running a development server locally using podman/python:
+
+- make sure _config.yml has "http://localhost:8000" as the site URL
+
+in one terminal:
+- podman run -it -v .:/mnt:Z docker.io/ruby:3.3.0-bookworm /bin/bash
+  - cd /mnt
+  - bundle install
+  - cd dogwood
+  - bundle install
+  - cd ..
+  - bundle exec jekyll build --watch
+
+in a new terminal while that's running
+- cd to ~/Documents/maprva-site/_site
+- python -m http.server