fix readme link and remove temp files

README.md

 # Sobel VHDL Lab
 
 - The questions must be answerd in the `docs/report.md` markdown document.
-- The FSM diagram and the address generator architecture must be updated in the `docs/img/soble-FSM.drawio` and `docs/img/sobel-adrgenUnit.drawio` with the [Draw.io tool](https://app.diagrams.net/){:target="_blank"}
+- The FSM diagram and the address generator architecture must be updated in the `docs/img/soble-FSM.drawio` and `docs/img/sobel-adrgenUnit.drawio` with the [Draw.io tool](https://app.diagrams.net/)

docs/report.md~

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