docs(README): 更新标题链接指向 github 仓库

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-# 🚀 [RISCV-LAB](https://code.educoder.net/ppg69fuwb/riscv-lab)
+# 🚀 [RISCV-LAB](https://github.com/Ciliphen/riscv-lab)

 从零开始的 RV64IMAZicsr_Zifencei 流水线设计实验