chore(dev): add build-docs command

Author: cpcloud

pixi.toml

@@ -166,6 +166,9 @@ benchcmp = { cmd = [
     "--benchmark-compare",
 ] }
 
+[target.linux.tasks.build-docs]
+cmd = ["make", "-C", "$PIXI_PROJECT_ROOT/docs", "html"]
+
 [target.linux.tasks.test]
 cmd = ["pytest", "$PIXI_PROJECT_ROOT/testing"]
 env = { NUMBA_CUDA_TEST_BIN_DIR = "$PIXI_PROJECT_ROOT/testing" }