docs: Update screengrabs

meta/caption-4

@@ -1 +1 @@
-A developer tools panel lists the landmarks and provides buttons you can use to inspect them in the DOM.
+A DevTools pane lets you inspect the landmarks, and provides best practice warnings.

meta/resize.sh

@@ -6,19 +6,24 @@ chromeBackgroundColour='rgb(250,250,250)'
 operaBackgroundColor='rgb(237,237,237)'
 edgeBackgroundColour='rgb(250,250,250)'
 
-function resize() {
+resize() {
 	browser=$1
 	size=$2
 	background=$3
-	echo $browser $size $background...
-	for image in meta/$browser-*.png; do
-		echo $image...
-		base=`basename $image`
-		convert -format png +repage -background $background -transparent orange -resize $size -gravity center -extent $size $image meta/out-$base
+	echo "$browser $size $background..."
+	for image in meta/"$browser"-*.png; do
+		echo "$image..."
+		base=$(basename "$image")
+		convert -format png +repage -background "$background" -transparent orange -resize "$size" -gravity center -extent "$size" "$image" meta/out-"$base"
 	done
 	echo
 }
 
-resize 'chrome' $chromeSize $chromeBackgroundColour
-resize 'opera' $operaSize $operaBackgroundColor
-resize 'edge' $edgeSize $edgeBackgroundColour
+if [ ! -x "$(which convert)" ]; then
+	echo "The ImageMagick 'convert' command can't be found; exiting."
+	exit 42
+else
+	resize 'chrome' $chromeSize $chromeBackgroundColour
+	resize 'opera' $operaSize $operaBackgroundColor
+	resize 'edge' $edgeSize $edgeBackgroundColour
+fi

package.json

@@ -9,7 +9,7 @@
     "clean:builds": "node scripts/build.js --browser all --clean-only",
     "preprofile": "node scripts/build.js --pre-process",
     "profile": "node scripts/profile.js",
-    "start:_core": "web-ext run --start-url http://matatk.agrip.org.uk/landmarks/world-of-wombats/",
+    "start:_core": "web-ext --no-config-discovery run --start-url https://matatk.agrip.org.uk/landmarks/world-of-wombats/",
     "start:chrome": "npm run start:_core -- --source-dir build/chrome --target chromium",
     "start:edge": "npm run start:_core -- --source-dir build/edge --target chromium --chromium-binary '/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge'",
     "start:firefox": "npm run start:_core -- --source-dir build/firefox",