Support for giving different title name

[excalith]

Discussed in https://github.com/excalith/excalith-start-page/discussions/64

^{Originally posted by NitroSniper January 16, 2024} Noticed that you have a small icon of your fetch in the tab which is really cool!

Made me wonder if you would add support for having a custom name for the title of the tab. This can be done by either having a "title" attribute in the data json. You can retain the current action if it is empty string or do something different.

[excalith]

Todo:

• Move username into prompt area
• Add title to terminal perhaps?

With those changes, we can change title as we want, without relying on the username and "Start Page" suffix.