Small docs cleanup (#22725)

* add images

* Add root README.md to docker container
old-commit-hash: 48ef2bcbf6

docs/Makefile

@@ -32,7 +32,7 @@ clean:
 	@echo "Copying docs & config to build folder..."
 	cp -a "$(DOCSDIR)" "$(BUILDDIR)"
 	cd "$(OPENPILOT_ROOT)" && \
-		find . -type f \( -name "*.md" -o -name "*.rst" \) \
+		find . -type f \( -name "*.md" -o -name "*.rst" -o -name "*.png" -o -name "*.jpg" \) \
 			-not -path "*/.*" \
 			-not -path "./build/*" \
 			-not -path "./docs/*" \

docs/docker/Dockerfile

@@ -30,6 +30,7 @@ COPY ./opendbc ${OPENPILOT_PATH}/opendbc
 COPY ./cereal ${OPENPILOT_PATH}/cereal
 COPY ./panda ${OPENPILOT_PATH}/panda
 COPY ./selfdrive ${OPENPILOT_PATH}/selfdrive
+COPY ./*.md ${OPENPILOT_PATH}/
 
 RUN scons -j$(nproc)