Remove root Makefile. Add dev docs link.

Makefile

@@ -1,34 +0,0 @@
-# used by docker_* targets
-docker_image ?= blog_os
-tag ?= 0.1
-pwd ?= $(realpath ./)
-ifeq ($(OS),Windows_NT)
-uid ?= 0
-gid ?= 0
-innerpwd ?= /root/blog_os
-else
-uid ?= $(shell id -u)
-gid ?= $(shell id -g)
-innerpwd ?= $(pwd)
-endif
-docker_cargo_volume ?=  blogos-$(uid)-$(gid)-cargo
-docker_rustup_volume ?=  blogos-$(uid)-$(gid)-rustup
-docker_args ?= -e LOCAL_UID=$(uid) -e LOCAL_GID=$(gid) -v $(docker_cargo_volume):/usr/local/cargo -v $(docker_rustup_volume):/usr/local/rustup -v $(pwd):$(innerpwd) -w $(innerpwd)
-docker_clean_args ?= $(docker_cargo_volume) $(docker_rustup_volume)
-
-# docker_* targets
-
-docker_build:
-	@docker build docker/ -t $(docker_image):$(tag)
-
-docker_iso:
-	@docker run --rm $(docker_args) $(docker_image):$(tag) make iso
-
-docker_interactive:
-	@docker run -it --rm $(docker_args) $(docker_image):$(tag)
-
-docker_clean:
-	@docker volume rm $(docker_clean_args)
-
-docker_riscv:
-	@docker run -it --rm $(docker_args) wangrunji0408/riscv-rust

README.md

@@ -4,6 +4,8 @@
 
 Rust port for uCore OS, supporting x86_64 and riscv32i.
 
+[Dev docs](https://rucore.gitbook.io/rust-os-docs/) (in Chinese)
+
 ## Summary
 
 This is a project of THU Operating System (2018 Spring) && Comprehensive Experiment of Computer System (2018 Summer).