Clean up Makefile by removing unused targets

Removed README_DEPS and lint target from Makefile.

Author: goruha

Makefile

@@ -0,0 +1,31 @@
+SHELL           := /bin/bash
+LAMBDA_DIR      := lambda
+DEPS_CONTAINER  := alpine:3.11
+
+-include $(shell curl -sSL -o .build-harness "https://cloudposse.tools/build-harness"; echo .build-harness)
+
+readme/build:
+	@atmos docs generate readme
+
+readme: 
+	@atmos docs generate readme
+
+define docker
+docker run -i -v $(PWD)/$(LAMBDA_DIR)/:/code -w /code $(DEPS_CONTAINER) /bin/sh -c '$(1)'
+endef
+
+## Install dependencies
+dependencies:
+	@echo "==> Installing Lambda function dependencies..."
+	@$(call docker, apk add --update py-pip && \
+	  pip install virtualenv && \
+	  virtualenv venv --always-copy && \
+	  source ./venv/bin/activate && \
+	  ./venv/bin/pip install -qUr requirements.txt)
+
+## Build Lambda function zip
+build: dependencies
+	@echo "==> Building Lambda function zip..."
+	@mkdir -p artifacts
+	@cd $(LAMBDA_DIR) && zip -r  ../artifacts/lambda.zip *
+	@ls -l artifacts/lambda.zip