Remove redundant home page check

The extra flags are not needed, due to the script's 3-layer design:

Layer 1: axe-core's incomplete category

axe-core (the underlying engine) classifies every rule result into
one of three buckets:

- violations — axe is certain this is a failure
- passes — axe is certain this passes
- incomplete — axe cannot determine the outcome programmatically

The canonical example is color contrast on a background image.
WCAG requires a 4.5:1 contrast ratio, and axe can compute that ratio
trivially when both colors are CSS values. But when the background is
an <img> or a background-image, axe can't know the actual pixel colors
under the text without rendering and sampling the image. So it marks
the result as incomplete and sets a needsFurtherReview: true flag,
meaning "a human should check this manually."

Layer 2: pa11y surfaces incomplete as errors anyway

pa11y's axe runner maps axe's incomplete results into the same JSON
array as definitive violations, giving them type: "error". The only
distinguishing field is runnerExtras.needsFurtherReview: true. pa11y
also exits with code 2 (failure) when there are any such items, even
if they're all needsFurtherReview. So pa11y, by itself, cannot cleanly
distinguish "definitely broken" from "maybe broken, check manually."

Layer 3: the Python filter

The script works around this by ignoring pa11y's exit code entirely,
capturing the JSON output with $(...) and counting errors itself:

real = [i for i in data
        if i.get('type') == 'error'
        and not i.get('runnerExtras', {}).get('needsFurtherReview', False)]

Only items that are both type == "error" AND needsFurtherReview == False
count toward the failure total. The needsFurtherReview items appear in
the JSON but are silently discarded.

Author: ctrueden

_bin/check-accessibility.sh

@@ -122,17 +122,6 @@ except Exception as e:
   fi
 }
 
-check_home() {
-  # Home page: ignore color-contrast and aria-required-children (all image-background
-  # issues flagged needsFurtherReview=true by axe, but pa11y --runner axe still exits
-  # non-zero for them).  Also ignore link-in-text-block in the hero section.
-  check_url "$BASE/index.html" \
-    --ignore "color-contrast" \
-    --ignore "aria-required-children" \
-    --ignore "link-in-text-block" \
-    --ignore "nested-interactive"
-}
-
 if [ "$#" -eq 0 ]; then
   # Default: check every page in _site/.
   tmplist=$(mktemp)
@@ -145,7 +134,6 @@ if [ "$#" -eq 0 ]; then
   rm -f "$tmplist"
 else
   # Check the home page plus each explicitly requested path.
-  check_home
   while [ "$#" -gt 0 ]; do
     check_url "$BASE/$1" \
       --ignore "nested-interactive"