Clarify open source licensing vs commercial support in documentation

[Copilot]

Problem

The documentation contained misleading language about the relationship between the software being "open source" and "free". Specifically, line 258 in readme.md stated:

Up to 100 users are free, more are possible with Nextcloud Enterprise

This phrasing created confusion because:

• The software is open source (AGPL v3 licensed) and can technically support unlimited users
• The "free" limitation refers to Nextcloud's support model, not the software functionality
• It conflated software freedom with commercial pricing

Solution

Updated the documentation to clearly distinguish between:

1. Software capabilities: The open source software can support any number of users
2. Support model: Nextcloud provides community support for up to 100 users, with commercial support available for larger deployments

Changes

Before:

### How many users are possible?
Up to 100 users are free, more are possible with Nextcloud Enterprise

After:

### How many users are possible?
This open source software can support any number of users. Nextcloud provides community support for up to 100 users, with Nextcloud Enterprise available for larger deployments requiring commercial support.

Impact

• Resolves the "actually open source but not free" confusion
• Accurately represents both the AGPL v3 license and Nextcloud's business model
• Provides clarity for users about what is freely available vs commercially supported
• Maintains consistency with the open source nature of the project

This is a documentation-only change that does not affect any functionality.

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