Placeholder updates

[trevorld]

• [ ] Move "beard" and "beardbw" service URLs from "http" to "https"
• [ ] Remove "cage" and "cagebw"? service currently not working
• [ ] Contact "kitten" service about newish buggy behaviour?
• [ ] Remove "lorempixel" and "lorempixelbw"? service currently not working
• [ ] Remove "murray" and "murraybw"? service currently not working
• [ ] Remove "placeimg" and "placeimgbw" - service documented as ending in July 2023
• [ ] Update relevant {ggpattern} vignette