fix: align vuejs README port mapping with actual behavior

[moinloin]

Fix: Align vuejs README port mapping with actual configuration

This pull request updates the vuejs/README.md to ensure consistency between the explanation and the docker-compose.yml example.

Changes made:

• Updated the explanation text to reflect that port 8080 on the host is mapped to port 8080 in the container.
• Updated the docker-compose.yml snippet to use "8080:8080" instead of "80:8080".

Why:

The previous example showed "80:8080", which didn't match the accompanying explanation or the actual behavior. This fix ensures clarity and avoids confusion for users following the guide.