Replace deprecated imagemagick invocation

Makefile

@@ -22,11 +22,9 @@ PRINTER_IMGS := $(addprefix build/controls-engineering-in-frc-printer/,$(wildcar
 SNIPPETS := $(wildcard snippets/*)
 
 ifeq ($(OS),Windows_NT)
-	CONVERT := magick convert
 	VENV_PYTHON := ./build/venv/Scripts/python3
 	VENV_PIP := ./build/venv/Scripts/pip3
 else
-	CONVERT := convert
 	VENV_PYTHON := ./build/venv/bin/python3
 	VENV_PIP := ./build/venv/bin/pip3
 endif
@@ -59,9 +57,9 @@ $(EBOOK_IMGS): build/controls-engineering-in-frc-ebook/%.jpg: %.jpg
 # cover: 4032x2016 -> 150dpi * 8.5" x 150dpi * 11" -> 1275x1650
 # banners: 4032x2016 -> 150dpi * 8.5" x 150dpi * 4.25" -> 1275x637
 	if [ "$<" = "imgs/cover.jpg" ]; then \
-		$(CONVERT) "$<" -resize 1275x1650 -quality 75 "$@"; \
+		magick "$<" -resize 1275x1650 -quality 75 "$@"; \
 	else \
-		$(CONVERT) "$<" -resize 1275x637 -quality 75 "$@"; \
+		magick "$<" -resize 1275x637 -quality 75 "$@"; \
 	fi
 
 $(PRINTER_IMGS): build/controls-engineering-in-frc-printer/%.jpg: %.jpg
@@ -70,9 +68,9 @@ $(PRINTER_IMGS): build/controls-engineering-in-frc-printer/%.jpg: %.jpg
 # cover: 4032x2016 -> 300dpi * 8.5" x 300dpi * 11" -> 2550x3300
 # banners: 4032x2016 -> 300dpi * 8.5" x 300dpi * 4.25" -> 2550x1275
 	if [ "$<" = "imgs/cover.jpg" ]; then \
-		$(CONVERT) "$<" -resize 2550x3300 -quality 95 "$@"; \
+		magick "$<" -resize 2550x3300 -quality 95 "$@"; \
 	else \
-		$(CONVERT) "$<" -resize 2550x1275 -quality 95 "$@"; \
+		magick "$<" -resize 2550x1275 -quality 95 "$@"; \
 	fi
 
 build/commit-date.tex: .git/refs/heads/$(shell git rev-parse --abbrev-ref HEAD) .git/HEAD