Graphic improvement on AsciiDoc blocks "sidebar", "example", "admonition", "collapsible".

[ggrossetie]

[ggrossetie]

We could create a custom admonitions such as: [PROBLEM], [THEOREM], [PROOF] or a single admonition with roles: [MATH.theorem].

Alternatively, we could stick with sidebar blocks and use a role:

actual

[[prob:2]]
.Formulation faible pour des conditions de Dirichlet homogènes
****
On cherche stem:[u \in H^1_0(\Omega)] telle que
[stem]
++++
\label{eq:65}
    \int_\Omega \nabla u \cdot \nabla v =  \int_\Omega f\, v,\quad \forall v \in H^1_0(\Omega)
++++
****

proposal

.Formulation faible pour des conditions de Dirichlet homogènes
[.formula#prob:2]
****
On cherche stem:[u \in H^1_0(\Omega)] telle que
[stem]
++++
\label{eq:65}
    \int_\Omega \nabla u \cdot \nabla v =  \int_\Omega f\, v,\quad \forall v \in H^1_0(\Omega)
++++
****

[ggrossetie]

Can we split this issue for each use case :

• collapsible = question / answer block ?
• sidebar = theorem/problem/proof blocks ?
• example = ???
• admonition = note / warning... ?