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/path.md

@@ -1,10 +1,13 @@
 # Path Functions
 
-> you can use path functions to operate valid path string
+You can use path functions to perform operations on valid path strings.
 
-### join(path: string, extra: string) -> string
+### `join(path: string, extra: string) -> string`
 
-This function can help you extend a path, you can extend any path, dirname or filename.
+<!-- TODO: Add specifics.
+From the example given, it seems like it just creates a subdirectory path.
+What would it do when "extending" file paths? -->
+Extend a path; you can extend both directory and file paths.
 
 ```lua
 local current_path = "~/hello/dioxus"
@@ -12,9 +15,9 @@ local new_path = plugin.path.join(current_path, "world")
 -- new_path = "~/hello/dioxus/world"
 ```
 
-### parent(path: string) -> string
+### `parent(path: string) -> string`
 
-This function will return `path` parent-path string, back to the parent.
+Return the parent path of the specified path. The parent path is always a directory.
 
 ```lua
 local current_path = "~/hello/dioxus"
@@ -22,14 +25,14 @@ local new_path = plugin.path.parent(current_path)
 -- new_path = "~/hello/"
 ```
 
-### exists(path: string) -> boolean
+### `exists(path: string) -> boolean`
 
-This function can check some path (dir & file) is exists.
+Check if the specified path exists, as either a file or a directory.
 
-### is_file(path: string) -> boolean
+### `is_file(path: string) -> boolean`
 
-This function can check some path is a exist file.
+Check if the specified path is a file.
 
-### is_dir(path: string) -> boolean
+### `is_dir(path: string) -> boolean`
 
-This function can check some path is a exist dir.
+Check if the specified path is a directory.