chore: add attribution to my other repositories

src/utils/richtext-to-segment.ts

···
+// taken from @atcute/bluesky-richtext-segmenter
+
 import type { Facet, FacetFeature } from './token-to-richtext';
 
 export interface RichtextSegment {

src/utils/token-to-richtext.ts

···
+// parts of this code are taken from tangled.sh:@mary.my.id/aglais
+
 import Stack from '@mary/ds-stack';
 
 import type { AppBskyRichtextFacet } from '@atcute/bluesky';