Improve CLI docs (#1404)

* Improve CLI docs

* Fixed all the typos (hopefully).
* Improved the bad English. This encompasses grammar, vocabulary, generally awkward phrases, etc. The result is easier to read and understand, and in some cases shorter.
* Made some formatting improvements. This includes making formatting more consistent, but I changed some of it to be better, at least in my opinion.
* Removed certain unnecessities, the biggest one being the commands documentation. I think this is unnecessary because of the `dx --help` command. It also needs to be updated every time a command gets added/updated/removed. It doesn't really provide much extra insight than `dx --help`.
* Improved plugin documentation. I added a warning to ignore all of it, which is ironic, but the fact is that plugins are probably going to change. But by the time I learned that, I already made some changes to the plugin docs. This includes a better guide on how to get started (although still bad since the plugin system is too messy), and some general changes like the aforementioned English or formatting.
* And more. I can't list it all, but I didn't use any destructive changes. The content might be reformatted (to be shorter or easier to understand), but the meaning isn't lost.

* Fix grammar in packages/cli/docs/src/creating.md

Co-authored-by: Evan Simkowitz <esimkowitz@users.noreply.github.com>

* Update README.md

* Change config example

---------

Co-authored-by: Evan Simkowitz <esimkowitz@users.noreply.github.com>

packages/cli/docs/src/plugin/interface/command.md

@@ -1,15 +1,15 @@
 # Command Functions
 
-> you can use command functions to execute some code & script
+You can use command functions to execute code and scripts.
 
-Type Define:
+Type definition:
 ```
 Stdio: "Inherit" | "Piped" | "Null"
 ```
 
 ### `exec(commands: [string], stdout: Stdio, stderr: Stdio)`
 
-you can use this function to run some command on the current system.
+You can use this function to run some commands on the current system.
 
 ```lua
 local cmd = plugin.command
@@ -18,4 +18,4 @@ manager.test = function ()
     cmd.exec({"git", "clone", "https://github.com/DioxusLabs/cli-plugin-library"})
 end
 ```
-> Warning: This function don't have exception catch.
+> Warning: This function doesn't catch exceptions.