add link in sidebar and update index page

Signed-off-by: Rachel Kurchin <[email protected]>

Author: rkurchin

_layout/menu.html

@@ -3,7 +3,8 @@
     <aside class="layout-menu">
       <div class="menu-category">JuliaMolSim</div>
       <div class="menu-item {{ispage index.html}}link{{end}}"><a href="/">Home</a></div>
-	  <div class="menu-item {{ispage juliacon21/index.html}}link{{end}}"><a href="/juliacon21" class="menu-list-link">JuliaCon 2021</a></div>
+      <div class="menu-item {{ispage molssi_workshop/index.html}}link{{end}}"><a href="/molssi_workshop" class="menu-list-link">MolSSI workshop</a></div>
+      <div class="menu-item {{ispage juliacon21/index.html}}link{{end}}"><a href="/juliacon21" class="menu-list-link">JuliaCon 2021</a></div>
 	  <div class="menu-item {{ispage juliacon22/index.html}}link{{end}}"><a href="/juliacon22" class="menu-list-link">JuliaCon 2022</a></div>
     </aside>
     <div class="layout-content">

index.md

@@ -8,10 +8,10 @@ Your friendly organisation about molecular and materials simulations in Julia.
 You can also check us out on [GitHub](https://github.com/JuliaMolSim)!
 
 @@colbox-blue
-Rachel and Michael will give a
+Rachel and Michael gave a
 [keynote at Juliacon 2024](https://juliacon.org/2024/keynotes/#materials_modeling_bonding_across_atoms_code_and_people)
 *Materials Modeling: Bonding across atoms, code, and people*.
-Their talk will also cover the latest developments around JuliaMolsim.
+Their talk also covered the latest developments around JuliaMolSim. (Once talks are online, we will add a YouTube link here)
 @@
 
 ## AtomsBase and AtomsCalculators ecosystem