Version 0.7.4

[BDonnot]

• [FIXED] a bug where, when you disconnect a load (or gen), the next action cannot be performed
  if it modifies the load (or gen), because you "cannot change the value of a disconnected load (or gen)"
• [FIXED] read-the-docs template is not compatible with latest sphinx version (7.0.0)
  see Add Sphinx 7 support readthedocs/sphinx_rtd_theme#1463
• [IMPROVED] initialize the underlying "PandaPowerBackend" without numba
• [IMPROVED] grid2op import to be more compliant with renaming of uppercased file names
• [IMPROVED] decoupling of the PandapowerBackend class and the class "internally" used by LightSimBackend
  when loading the grid. This caused some issue, eg sim2real and storage units grid2op#508