chore: improve CONTRIBUTING.md (#493)

* docs(contributing.md): added more useful commands to file

This commit aims to improve the commands avaible to the reader. New commands offer more ways of
consuming the repo while the old test commands have been replaced for commands that always produce
the cypress GUI (if you ignore the --skip-nx-cache flag, you only get the cypress GUI the first time
you run the command. Any time you run it afterwards you get a very meaningless message on the
terminal).

* docs(contributing.md): better readbility of sentence

Replaces "docs" for "documentation" as the file calls it that everywhere else.

Author: TheMcnafaha

CONTRIBUTING.md

@@ -66,31 +66,63 @@ git checkout -b my-fix-branch main
 pnpm install
 ```
 
-- Then run this command:
+- Download [Nx](https://nx.dev/):
 
 ```shell
-npx nx@latest serve website
+pnpm install --global nx@latest
+```
+
+- Then run this command to get the qwik-ui documentation site in dev mode:
+
+```shell
+pnpm website
 ```
 
 - Visit the URL printed in the console and you'll have a page opened with the suite of widgets.
 
 - Once you made some changes in either package (`headless`, `tailwind` or `material`), you will see them immediately reflected on the page.
 
+Below is a list of other commands that you might find useful:
+
+- Build the qwik-ui documentation:
+
+```shell
+nx build website
+```
+
+- Preview of the qwik-ui documentation (no HMR):
+
+```shell
+nx preview website
+```
+
+- Build the Cloudfare version of the qwik-ui documentation
+
+```shell
+nx build-cloudfare website
+```
+
+- Preview the Cloudfare build of the qwik-ui documentation (no HMR)
+
+```shell
+nx preview-cloudflare website
+```
+
 ### ▶ 5. Make sure you add / modify tests
 
-Run either command to make sure there aren't any errors:
+Run either command to make sure there aren't any errors.
 
 ```shell
-nx component-test headless
+nx component-test headless --skip-nx-cache
 ```
 
 Or
 
 ```shell
-pnpm run test:headless
+pnpm run test:headless --skip-nx-cache
 ```
 
-Both commands run the same tests. You are free to choose which syntax you prefer.
+Both commands will set up the Cypress component testing GUI, so you are free to chose which syntax you prefer. Please refer to official Cypress [documentation](https://docs.cypress.io/guides/overview/why-cypress) for further assistance.
 <br/>
 
 ### ▶ 6. Commit your changes using commitizen:
@@ -130,13 +162,13 @@ If you need to update your PR for some reason -
 - Re-run the tests to ensure tests are still passing:
 
 ```shell
-nx component-test headless
+nx component-test headless --skip-nx-cache
 ```
 
 Or
 
 ```shell
-pnpm run test:headless
+pnpm run test:headless --skip-nx-cache
 ```
 
 - Rebase your branch and force push to your GitHub repository (this will update your Pull Request):