remove duplicate 'The' word (#408)

Author: sawatkins

docs/docs/advanced-flag/tailwind.md

@@ -36,7 +36,7 @@ The project tree would look like this:
 
 ## Standalone Tailwind CLI
 
-The The idea is to avoid using Node.js and npm to build output.css.
+The idea is to avoid using Node.js and npm to build output.css.
 
 The Makefile will have entries for downloading and compiling CSS. It will automatically detect the OS and download the latest release from the [official repository](https://github.com/tailwindlabs/tailwindcss/releases).