[libc++] Remove status pages tracking SpecialMath and Zip (llvm#105672)

Instead of tracking those using our static CSV files, I created lists of
subtasks in their respective issues (llvm#99939 and llvm#105169) to track the
work that is still left.

Author: ldionne

libcxx/docs/ReleaseNotes/19.rst

@@ -46,7 +46,8 @@ Work on the experimental C++17 Parallel STL has progressed. See
 :ref:`pstl-status` for the current status.
 
 Work on the C++17 mathematical special functions has started. See
-:ref:`special-math-status` for the current status.
+`this issue <https://github.com/llvm/llvm-project/issues/99939>`__
+for the current status.
 
 Implemented Papers
 ------------------

libcxx/docs/Status/Cxx17.rst

@@ -39,7 +39,7 @@ Paper Status
 .. note::
 
    .. [#note-P0067R5] P0067R5: ``std::(to|from)_chars`` for integrals has been available since version 7.0. ``std::to_chars`` for ``float`` and ``double`` since version 14.0 ``std::to_chars`` for ``long double`` uses the implementation for ``double``.
-   .. [#note-P0226] P0226: Progress is tracked `here <https://libcxx.llvm.org/Status/SpecialMath.html>`_.
+   .. [#note-P0226] P0226: Progress is tracked `here <https://github.com/llvm/llvm-project/issues/99939>`_.
    .. [#note-P0607] P0607: The parts of P0607 that are not done are the ``<regex>`` bits.
    .. [#note-P0154] P0154: The required macros are only implemented as of clang 19.
    .. [#note-P0452] P0452: The changes to ``std::transform_inclusive_scan`` and ``std::transform_exclusive_scan`` have not yet been implemented.

libcxx/docs/Status/SpecialMath.rst

@@ -50,8 +50,6 @@ Getting Started with libc++
    Status/Format
    Status/Parallelism
    Status/PSTL
-   Status/SpecialMath
-   Status/Zip
 
 
 .. toctree::