Fix code scanning alert no. 2: Reflected cross-site scripting

[MichaelKreil]

Fixes https://github.com/versatiles-org/versatiles-frontend/security/code-scanning/2

To fix the reflected cross-site scripting vulnerability, we need to sanitize the user input before incorporating it into the response. The best way to do this is by using a well-known library for escaping HTML, such as escape-html. This will ensure that any potentially malicious characters in the req.path are properly escaped, preventing XSS attacks.

• General Fix: Use contextual output encoding/escaping before writing user input to the response.
• Detailed Fix: Import the escape-html library and use it to sanitize req.path before including it in the response.
• Specific Changes: Modify the file src/server/server.ts to include the escape-html library and apply it to the req.path on line 75.

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