Test new `thebe-lite` with JupyterLite Kernel

[michaelweinold]

...there is new and improved documentation on thebe-lite.

Related issues:

thebe

• https://github.com/executablebooks/thebe/issues/692
• https://github.com/executablebooks/thebe/pull/700

sphinx-thebe

• https://github.com/executablebooks/sphinx-thebe/issues/65

[michaelweinold]

Existing examples:

The main example page:

• https://executablebooks.github.io/thebe/

now uses JupyterLite. It also includes, in section Other static examples more specific thebe-lite examples:

• https://executablebooks.github.io/thebe/lite.html