Drop support for theia as a browser editor

[apolopena]

Describe the bug

Gitpod no longer supports Theia as a browser editor so gitpod-laravel-starter should not either

simply removing the .theia directory from this repository should fix the bug and not be considered a breaking change since Gitpod users no longer have the option of using Theia at all.

Screenshots

Steps to reproduce

Expected behavior

Additional information

[apolopena]

This change affects the tools for this project, so:

• Add support for this in the updater: https://github.com/apolopena/gls-tools/blob/main/tools/update.sh
• Add support for this in the manifest generator: https://github.com/apolopena/gls-tools/blob/main/tools/manifest.sh

See apolopena/gls-tools@d410209