add guac links to past presentations (#885)

* add guac links to past presentations

Signed-off-by: Brandon Lum <lumjjb@gmail.com>

* address comments

Signed-off-by: Brandon Lum <lumjjb@gmail.com>

---------

Signed-off-by: Brandon Lum <lumjjb@gmail.com>

README.md

@@ -50,8 +50,10 @@ refer to [how GUAC works](https://docs.guac.sh/how-guac-works/).
 
 - [CycloneDX](https://github.com/CycloneDX/specification)
 - [Dead Simple Signing Envelope](https://github.com/secure-systems-lab/dsse)
+- [Deps.dev API](https://deps.dev/)
 - [In-toto ITE6](https://github.com/in-toto/attestation)
 - [OpenSSF Scorecard](https://github.com/ossf/scorecard)
+- [OSV](https://osv.dev/)
 - [SLSA](https://github.com/slsa-framework/slsa)
 - [SPDX](https://spdx.dev/specifications/)
 
@@ -64,9 +66,11 @@ if you encounter any errors or bugs with ingestion.
 
 ## Additional References
 
+- [GUAC presentation at OSS NA 2023](https://sched.co/1K5Hn)
+- [GUAC 2023 Q1 Maintainer Summit Notes](https://docs.google.com/document/d/15Kb3I3SWhq-9_R7WYhSjsIxn_FykYgPyFlQWlLgF4fA/edit)
+- [GUAC presentation at KubeCon NA 2022](https://www.youtube.com/watch?v=xFRNgIEzbkA)
 - [GUAC Intro Slides](https://docs.google.com/presentation/d/1WF4dsJiwR6URWPgn1aiHAE3iLVl-oGP4SJRWFpcOlao/edit#slide=id.p)
 - [GUAC Design Doc](https://docs.google.com/document/d/1N5x0HErb-kmCPgG9M8TwBEOGIVU54clqp_X4KhtNJI8/edit)
-- [GUAC 2023 Q1 Maintainer Summit Notes](https://docs.google.com/document/d/15Kb3I3SWhq-9_R7WYhSjsIxn_FykYgPyFlQWlLgF4fA/edit)
 
 ## Communication