fix(docs): suppress intersphinx external warnings

Suppress warnings for external intersphinx inventories (numpy, pandas)
that may be temporarily unavailable. These transient 500 errors from
external documentation sites should not fail our documentation builds.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Signed-off-by: Joe Isaacs <[email protected]>

Author: joseph-isaacs

docs/conf.py

@@ -52,6 +52,11 @@
 nitpicky = True  # ensures all :class:, :obj:, etc. links are valid
 nitpick_ignore = []
 
+# Suppress warnings for external intersphinx inventories that may be temporarily unavailable
+suppress_warnings = [
+    "intersphinx.external",
+]
+
 doctest_global_setup = "import pyarrow; import vortex; import vortex as vx; import random; random.seed(a=0)"
 doctest_default_flags = (
     doctest.ELLIPSIS | doctest.IGNORE_EXCEPTION_DETAIL | doctest.DONT_ACCEPT_TRUE_FOR_1 | doctest.NORMALIZE_WHITESPACE