Add a .gramps import file for WebSearch demonstration

[jurchello]

Include a sample .gramps file in the WebSearch project to serve as a demonstration and testing resource. This file contains UID custom attributes associated with a well-known historical figure (George Washington), allowing users to explore the WebSearch Gramplet's functionality without needing to manually create data.

https://gramps.discourse.group/t/a-new-websearch-gramplet-is-ready/7188/230?u=urchello

[jurchello]

@emyoulation what do you think about this task? Does it make sense on your mind when WebSearch has so many features? Im not sure that anybody will install the testing .gramps db to research the gramplet.

[emyoulation]

I think that instead, we could include a link (in the Wiki help page) to a Disourse thread which has the .gramps file attached.

The showing of a placeholder feature where an UID attribute is supported but is "missing" will help a lot. Bring up a pre-populated Edit Attribute dialog on a double-click will help them find the right label.

Finding correct Attribute label will be the biggest challenge for most Users.