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/SUMMARY.md

@@ -2,17 +2,12 @@
 
 - [Introduction](./introduction.md)
 - [Installation](./installation.md)
-- [Create a Project](./creating.md)
-- [Configure Project](./configure.md)
-- [Commands](./cmd/README.md)
-  - [Build](./cmd/build.md)
-  - [Serve](./cmd/serve.md)
-  - [Clean](./cmd/clean.md)
-  - [Translate](./cmd/translate.md)
-- [Plugin Development](./plugin/README.md)
-  - [API.Log](./plugin/interface/log.md)
-  - [API.Command](./plugin/interface/command.md)
-  - [API.OS](./plugin/interface/os.md)
-  - [API.Directories](./plugin/interface/dirs.md)
-  - [API.Network](./plugin/interface/network.md)
-  - [API.Path](./plugin/interface/path.md)
+- [Create a project](./creating.md)
+- [Configure a project](./configure.md)
+- [Plugin development](./plugin/README.md)
+  - [API.Log](plugin/interface/log.md)
+  - [API.Command](plugin/interface/command.md)
+  - [API.OS](plugin/interface/os.md)
+  - [API.Directories](plugin/interface/dirs.md)
+  - [API.Network](plugin/interface/network.md)
+  - [API.Path](plugin/interface/path.md)