Mention Versioning Issues in Hypermedia Applications that use Fragments

[fabb]

I'm opening this PR to start a discussion of versioning issues that can happen in hypermedia applications and when using htmx for fetching fragments. I feel this issue is neglected in the documentation and should be represented in a balanced way, ideally with examples on how to mitigate the issues.

Examples on when an inconsistent state could happen aways assume that the client browser loaded a full htmx page, then a server application update is deployed, and then the client executes some action that loads a fragment into the dom somewhere:

• Example 1: a loaded fragment references html elements outside of the fragment that have been added in an application update on the server, but are not yet contained in the browser dom.
• Example 2: a loaded fragment references css classes that have been updated or added in an application update on the server
• Example 3: an endpoint for fetching a fragment might have been removed in an application update on the server, but is still referenced in htmx element attributes in the browser dom.

Even if these cases are rare (depends on the number of users and deployment frequency), it would be great to give devs heads-up on potential issues.

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