Remove old thebe package

[mkoeppe]

(split out from #24593)

Follow-up on #33309, which disabled use of the old thebe in our HTML documentation.

CC: @kwankyu @nthiery

Component: packages: standard

Author: Matthias Koeppe

Branch/Commit: 9621c97

Reviewer: Kwankyu Lee

Issue created by migration from https://trac.sagemath.org/ticket/33529

[mkoeppe]

Branch: u/mkoeppe/remove_old_thebe_package

[mkoeppe]

New commits:

e881abc	build/pkgs/thebe: Remove
9621c97	build/pkgs/sagemath_doc_html/dependencies: Remove thebe

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 9621c97

[nthiery]

comment:3

+1; let it be now that jupyter-sphinx will provide a robust
Thebe implementation.

[kwankyu]

comment:4

This merge-conflict with #33507. Maybe could be resolved here.

[mkoeppe]

comment:5

Done

[kwankyu]

Reviewer: Kwankyu Lee

[kwankyu]

comment:6

It is safe to remove Thebe from sage.

[vbraun]

Changed branch from u/mkoeppe/remove_old_thebe_package to 9621c97