Release 25.03

25.03

• the nova2 net was renamed nova, and the old nova
  net was removed (#1746, #1768)

• small improvements to the he-burn scripts (#1765)

• documentation updates (#1741, #1744, #1747, #1751, #1756, #1759,
  #1760, #1766, #1767)

• restrict Sphinx < 8.2.0 due to nbsphinx issues (#1762)

• centralize some common unit test runtime parameters (#1749) and
  explicitly set small_dens and small_temp for some tests
  (#1757)

• remove old, unneeded macros from the build system (#1717, #1753,
  #1754, #1755)

• modernize parallel loops in some unit tests (#1752)

• update the HIP CI action to a later runner

• namespace and clang-tidy fixes (#1745)