Add reference to JuliaCon 2023 talk in README and docs

Co-Authored-By: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>
Co-Authored-By: Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>

Author: 3 people

README.md

@@ -287,6 +287,12 @@ MultilayerGraphs.jl (v1.1) and its features were announced on the following plat
 - **Who:** [Pietro Monticone](https://github.com/pitmonticone) and [Claudio Moroni](https://github.com/ClaudMor)
 - **What:** "Multilayer Network Science in Julia with [`MultilayerGraphs.jl`](https://github.com/JuliaGraphs/MultilayerGraphs.jl)" ([Website](http://www.fields.utoronto.ca/talks/Multilayer-Network-Science-Julia-MultilayerGraphsjl), [Slides](https://inphyt.github.io/Talks/2023/WAW/index.html), [Video](https://youtu.be/hB8Vrwkwax0))
 
+### [JuliaCon 2023](https://juliacon.org/2023/)
+
+- **When:** 2023/07/25 - 2023/07/29
+- **Where:** [Massachusetts Institute of Technology](https://www.mit.edu), Cambridge, MA, USA
+- **Who:** [Pietro Monticone](https://github.com/pitmonticone) and [Claudio Moroni](https://github.com/ClaudMor)
+- **What:** "[`MultilayerGraphs.jl`](https://github.com/JuliaGraphs/MultilayerGraphs.jl): Multilayer Network Science in Julia" ([Website](https://pretalx.com/juliacon2023/talk/MS7YWQ/), [Short Presentation](https://inphyt.github.io/Talks/2023/JuliaCon/long/index.html), [Long Presentation](https://inphyt.github.io/Talks/2023/JuliaCon/long/index.html), [Video](https://www.youtube.com/c/TheJuliaLanguage))
 
 ## 📦 Related Packages 
 

docs/src/index.md

@@ -1013,6 +1013,13 @@ MultilayerGraphs.jl (v1.1) and its features were announced on the following plat
 - **Who:** [Pietro Monticone](https://github.com/pitmonticone) and [Claudio Moroni](https://github.com/ClaudMor)
 - **What:** "Multilayer Network Science in Julia with [`MultilayerGraphs.jl`](https://github.com/JuliaGraphs/MultilayerGraphs.jl)" ([Website](http://www.fields.utoronto.ca/talks/Multilayer-Network-Science-Julia-MultilayerGraphsjl), [Slides](https://inphyt.github.io/Talks/2023/WAW/index.html), [Video](https://youtu.be/hB8Vrwkwax0))
 
+### [JuliaCon 2023](https://juliacon.org/2023/)
+
+- **When:** 2023/07/25 - 2023/07/29
+- **Where:** [Massachusetts Institute of Technology](https://www.mit.edu), Cambridge, MA, USA
+- **Who:** [Pietro Monticone](https://github.com/pitmonticone) and [Claudio Moroni](https://github.com/ClaudMor)
+- **What:** "[`MultilayerGraphs.jl`](https://github.com/JuliaGraphs/MultilayerGraphs.jl): Multilayer Network Science in Julia" ([Website](https://pretalx.com/juliacon2023/talk/MS7YWQ/), [Short Presentation](https://inphyt.github.io/Talks/2023/JuliaCon/long/index.html), [Long Presentation](https://inphyt.github.io/Talks/2023/JuliaCon/long/index.html), [Video](https://www.youtube.com/c/TheJuliaLanguage))
+
 ## 📦 Related Packages 
 
 ### R