Add Signbank 2.0 (de Quadros et al., 2024) to bilingual dictionaries

[AmitMY]

Summary

• Adds a one-sentence reference to Signbank 2.0 (de Quadros et al., 2024, SignLang @ LREC-COLING) in the Bilingual dictionaries section, summarizing it as an open-source, corpus-linked sign documentation platform with linguistic and visual (handshape-similarity) search and EAF-aligned corpus occurrences.
• Appends the corresponding BibTeX entry to src/references.bib.

Test plan

• Confirm citation key de-quadros-etal-2024-signbank resolves in the rendered site.
• Verify section placement (Resources -> Bilingual dictionaries) reads naturally.

Paper: https://aclanthology.org/2024.signlang-1.34/

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