docs: Update branding and navigation across documentation site

docs/network/overview.md

@@ -87,14 +87,14 @@ Build distributed applications with real-world networking:
 - Simulate network topologies
 - Remote debugging
 
-### ThreeFold Grid Access
+### Mycelium Cloud Access
 
-Connect to services on the ThreeFold Grid:
+Connect to services deployed via Mycelium Cloud:
 
 - Access deployed workloads
 - Manage your infrastructure
 - Use decentralized services
-- Build on the grid
+- Build on the platform
 
 ## Key Features
 
@@ -121,7 +121,7 @@ Connect to services on the ThreeFold Grid:
 ### vs Other Overlay Networks
 
 - ✅ **IPv6 native** – Not limited to IPv4 address space  
-- ✅ **Production ready** – Used in ThreeFold infrastructure  
+- ✅ **Production ready** – Used in Mycelium infrastructure  
 - ✅ **Active development** – Continuous improvements  
 - ✅ **Open source** – Transparent and auditable  
 
@@ -156,5 +156,3 @@ Ready to try Mycelium? It's simple:
 ## Resources
 
 - **Source Code** – [github.com/threefoldtech/mycelium](https://github.com/threefoldtech/mycelium)
-- **Community** – [t.me/threefold/1](https://t.me/threefold/1)
-- **Forum** – [forum.threefold.io](https://forum.threefold.io)