refactor: Rephrase project description in README file

docs: Add testing instruction and credits to README file

docs: Add References & Credits to README file

docs: Add testing instructions to README file

style: Update hero image on index page

fix: syntax error in index.html

docs: Update README with project details

chore(config): load SECRET_KEY and DEBUG from env vars

style: Update style.css

chore(css): bump style.css to refresh hashed asset on Heroku

fix(forms): render field errors via loop; remove stray error placeholders

content(ui): add concise messages + logo

security: load SECRET_KEY from env; DEBUG/ALLOWED_HOSTS via env

chore(secrets): add python-dotenv and ignore .env

style(navbar): Update background color