Modified readme

[AnthonyAndroulakis]

• fixed docs url
• made image smaller
• edited showcase/try-it-online section

[kolibril13]

hi @AnthonyAndroulakis ! 👋🏼

Together with @manzt I've recently made https://github.com/niivue/ipyniivue-experimental
It's another approach compared to your amazing efforts to bring niivue to Jupyter. With the help of the new framework called "anywidget" (https://anywidget.dev/), we have now an easier dev-setup (Hot Module Replacement, less boilerplate and simpler build configuration).

With @neurolabusc we discussed that we soon want to migrate all the code from ipyniivue-experimental to this ipyniivue repo. Thereby, the current code of this repository will be replaced by the code of https://github.com/niivue/ipyniivue-experimental and there will be a 2.0 release.

@AnthonyAndroulakis : Your code will still persist in the version history, and old versions of your ipyniivue implementation will still be installable via pip install ipyniivue==1.1.0

In the migration process, we will probably also re-write the readme, so the changes from this pr might be changed again soon, but I suggest let's merge this pr :)

[kolibril13]

I'll merge this now!