remove deprecated developers.md and tutorial.md, which has been conso…

…lidated in the readme. fix ssl issue with downloading the shared library (see https://stackoverflow.com/questions/68275857/urllib-error-urlerror-urlopen-error-ssl-certificate-verify-failed-certifica). reorganize content ordering in readme and better organize content of the gelu tutorial

Makefile

@@ -1,7 +1,7 @@
 NUM_JOBS=$(shell nproc)
 CXX=clang++
 
-.PHONY: default examples/hello_world/build/hello_world tests libgpu debug build check-entr check-clang clean-build clean all watch-tests
+.PHONY: default examples/hello_world/build/hello_world tests libgpu debug build check-entr check-clang clean-build clean all watch-tests docs
 
 GPUCPP ?= $(PWD)
 LIBDIR ?= $(GPUCPP)/third_party/lib
@@ -24,7 +24,7 @@ all: dawnlib check-clang check-linux-vulkan
  cd examples/physics && make build/physics
  cd examples/render && make build/render
 
-docs:
+docs: Doxyfile
  doxygen Doxyfile
 
 ################################################################################