docs: drop the portfolio project-page link from the README

The project page duplicates what the README already says, so it adds
nothing for someone reading the repo.

Claude-Session: https://claude.ai/code/session_01TQu2a6zpFRHHJzLLYZqe1v

Author: RubenGlez

README.md

@@ -8,8 +8,6 @@
 
 [![latest release](https://img.shields.io/github/v/release/RubenGlez/samplebyte)](https://github.com/RubenGlez/samplebyte/releases/latest)
 
-**Project page:** [rubenglez.dev/samplebyte](https://rubenglez.dev/samplebyte)
-
 SampleByte is an open-source desktop app built to handle the full workflow from finding audio to loading a finished sample pack onto your hardware. No more jumping between tools.
 
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