Update README.md, delete symbolic links and robocomp_ws, use $USER

[alfiTH]

Your checklist for this pull request

• Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your main!
• Make sure you are making a pull request against the development branch (left side). Also you should start your branch off our development.
• Check the commit's or even all commits' message styles matches our requested structure.
• I have added necessary documentation (if appropriate)
• It's small enought so they can be easily reviewed.
• I have CONSIDERED or ADDED a unit test if the PR resolves an issue.

Types of changes

What types of changes does your code introduce to Robocomp?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code style update (formatting, renaming)
• [x ] Documentation Update
• Build related changes
• Other (please describe):

Does this close any currently open issues?

Issue ID: [ ]

Description

Please describe your pull request.

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Thank you!