feat: Rebuild About page + optimize landing illustrations and add dev tooling

.github/copilot-instructions.md

@@ -25,7 +25,7 @@ This is a **static marketing website** for RocketPy (rocketpy.org) - an open-sou
 
 ### Image Assets
 - Background images are referenced in CSS using optimized assets (e.g., `url("../images/hero-background.png")`)
-- Section illustrations use descriptive filenames (e.g., `hero-logo-illustration.png`, `community-visual.png`)
+- Section illustrations are scalable SVGs with descriptive filenames (e.g., `hero-trajectory.svg`, `community-network.svg`)
 - Favicon and logo files are in `images/` directory
 
 ## Development Workflow
@@ -36,6 +36,15 @@ npm run format  # Runs Prettier on all HTML, CSS, JS files
 ```
 Only dev dependency is Prettier (v3.3.3). Always format before committing.
 
+### Local Preview
+```bash
+make start    # serve the source files at http://127.0.0.1:8000 (override with PORT=)
+make status   # check whether the dev server is running
+make stop     # stop the dev server
+make build    # build the minified site into dist/
+```
+The `make` targets wrap `scripts/devserver.py`, a cross-platform (Windows/macOS/Linux) manager for a detached `python -m http.server`. Run `make help` to list all targets.
+
 ### Deployment
 - **Automatic deployment** via GitHub Actions (`.github/workflows/static.yml`)
 - Triggers on push to `master` branch

.gitignore

@@ -4,6 +4,9 @@ node_modules/
 # Build output
 dist/
 
+# Local dev server
+.devserver.pid
+
 # OS files
 .DS_Store
 Thumbs.db

Makefile

@@ -0,0 +1,41 @@
+# RocketPy site - local dev helpers.
+# Run `make help` to list the available targets.
+
+PORT ?= 8000
+HOST ?= 127.0.0.1
+export PORT HOST
+
+.PHONY: help start stop restart status build serve-dist format
+
+help:
+	@echo Targets:
+	@echo   make start       - start the local dev server on the source files
+	@echo   make stop        - stop the dev server
+	@echo   make restart     - restart the dev server
+	@echo   make status      - show whether the server is running
+	@echo   make build       - build the minified site into dist/
+	@echo   make serve-dist  - build then preview the production dist/ output
+	@echo   make format      - run prettier on html/css/js
+	@echo Override the port with e.g. make start PORT=3000
+
+start:
+	@python scripts/devserver.py start
+
+stop:
+	@python scripts/devserver.py stop
+
+restart:
+	@python scripts/devserver.py restart
+
+status:
+	@python scripts/devserver.py status
+
+build:
+	@npm run build
+
+serve-dist: build
+	@python scripts/devserver.py stop
+	@python -m http.server $(PORT) --directory dist --bind $(HOST)
+
+format:
+	@npm run format