build(npm): automatically run build-icons for correct os (#2360)

README.md

@@ -269,10 +269,10 @@ https://www.python.org/downloads/
 > **Note**
 > Make sure your Python install includes [pip](https://pypi.org/project/pip/)
 
-<h3>Install Selenium</h3>
+<h3>Install Dependencies</h3>
 
 ```bash
-python3 -m pip install --upgrade pip && pip install selenium==4.1.0 requests==2.25.1
+python -m pip install -r ./.github/scripts/requirements.txt
 ```
 
 <h3 id="building-icons">Build the new icons</h3>
@@ -281,11 +281,7 @@ python3 -m pip install --upgrade pip && pip install selenium==4.1.0 requests==2.
 Usually, this is done on each release, but you can have a sneak peek before a release.</p>
 
 ```bash
-# Linux/Unix
 npm run build-icons
-
-# Windows
-python3 ./.github/scripts/icomoon_build_githubless.py ./.github/scripts/build_assets/geckodriver-v0.32.2-win64/geckodriver.exe ./icomoon.json ./devicon.json ./icons ./ --headless
 ```
 
 <i>The process might take a while, depending on your operating system's speed and the amount of icons.</i>
@@ -311,7 +307,7 @@ npm run dev # Will run on port 8000
 <p>Or this command, which does exactly the same, but the port can be customized.</p>
 
 ```bash
-python3 -m http.server <port>
+python -m http.server <port>
 ```
 
 <p>You're done now! :tada: Your build of Devicons should be available at <code>https://localhost:8000</code> (or the desired port).</p>