Add Makefile and format checking workflow

- Add Makefile with dev server and prettier formatting
- Add GitHub Actions workflow to check code formatting
- Workflow fails if code needs formatting to maintain code quality

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: thavelick

.github/workflows/format-check.yml

@@ -0,0 +1,22 @@
+name: Format Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "18"
+
+      - name: Check code formatting
+        run: npx prettier --check .

Makefile

@@ -0,0 +1,64 @@
+# Sane defaults
+SHELL := /bin/bash
+.ONESHELL:
+.SHELLFLAGS := -eu -o pipefail -c
+.DELETE_ON_ERROR:
+MAKEFLAGS += --warn-undefined-variables
+MAKEFLAGS += --no-builtin-rules
+
+# ---------------------- COMMANDS ---------------------------
+dev: # Start development server
+	@echo "Starting development server.."
+	cd public_html && python -m http.server 8000
+
+format: # Format code with prettier
+	@echo "Formatting code.."
+	npx prettier --write --check .
+
+# -----------------------------------------------------------
+# CAUTION: If you have a file with the same name as make
+# command, you need to add it to .PHONY below, otherwise it
+# won't work. E.g. `make run` wouldn't work if you have
+# `run` file in pwd.
+.PHONY: help
+
+# -----------------------------------------------------------
+# -----       (Makefile helpers and decoration)      --------
+# -----------------------------------------------------------
+
+.DEFAULT_GOAL := help
+# check https://stackoverflow.com/questions/4842424/list-of-ansi-color-escape-sequences
+NC = \033[0m
+ERR = \033[31;1m
+TAB := '%-20s' # Increase if you have long commands
+
+# tput colors
+red := $(shell tput setaf 1)
+green := $(shell tput setaf 2)
+yellow := $(shell tput setaf 3)
+blue := $(shell tput setaf 4)
+cyan := $(shell tput setaf 6)
+cyan80 := $(shell tput setaf 86)
+grey500 := $(shell tput setaf 244)
+grey300 := $(shell tput setaf 240)
+bold := $(shell tput bold)
+underline := $(shell tput smul)
+reset := $(shell tput sgr0)
+
+help:
+	@printf '\n'
+	@printf '    $(underline)Available make commands:$(reset)\n\n'
+	@# Print commands with comments
+	@grep -E '^([a-zA-Z0-9_-]+\.?)+:.+#.+$$' $(MAKEFILE_LIST) \
+		| grep -v '^env-' \
+		| grep -v '^arg-' \
+		| sed 's/:.*#/: #/g' \
+		| awk 'BEGIN {FS = "[: ]+#[ ]+"}; \
+		{printf "    make $(bold)$(TAB)$(reset) # %s\n", \
+			$$1, $$2}'
+	@grep -E '^([a-zA-Z0-9_-]+\.?)+:( +\w+-\w+)*$$' $(MAKEFILE_LIST) \
+		| grep -v help \
+		| awk 'BEGIN {FS = ":"}; \
+		{printf "    make $(bold)$(TAB)$(reset)\n", \
+			$$1}' || true
+	@echo -e ""