docs: add kapa.ai to pkgdown config - #1074

    1 files  ± 0     30 suites  +1   1m 57s ⏱️ +4s
  249 tests + 2    249 ✅ + 2  0 💤 ±0  0 ❌ ±0 
1 856 runs  +16  1 856 ✅ +16  0 💤 ±0  0 ❌ ±0 

Results for commit 0a7daa7. ± Comparison against earlier commit 13e9c00.