doc: update the quickstart guide and make it easier to follow (#303)

* update c/c++ plugins quickstart guide

Signed-off-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>

* update examples/plugin_v2 instructions because it is linked from the
quickstart guide

Signed-off-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>

* fix empty on_remove implementation

Signed-off-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>

* fix dangerous sourcing of the dependency installation script

Signed-off-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>

* add python instructions and fix cache size issue

Signed-off-by: Yao Xiao <yx2436@nyu.edu>

* make it one-liner

Signed-off-by: Yao Xiao <yx2436@nyu.edu>

---------

Signed-off-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>
Signed-off-by: Yao Xiao <yx2436@nyu.edu>
Co-authored-by: cyaoxiao <cyaoxiao@node0.cyaoxiao-292586.cs2640-pg0.utah.cloudlab.us>
Co-authored-by: Juncheng Yang <1a1a11a@users.noreply.github.com>

Author: 3 people

README.md

@@ -76,7 +76,8 @@ cachesim supports the following algorithms:
 ### One-line install
 We provide some scripts for quick installation of libCacheSim.
 ```bash
-cd scripts && bash install_dependency.sh && bash install_libcachesim.sh
+cd scripts && bash ./install_dependency.sh && source ~/.bashrc && bash ./install_libcachesim.sh
+# Replace ~/.bashrc with ~/.zshrc if you are using zsh on macos
 ```
 If this does not work, please
 1. let us know what system you are using and what error you get