fix: split long slides and auto-fit diagrams in labdesign

- Add .mermaid svg CSS to scale diagrams to fit slide bounds
- Split Requirements into Requirements+Details / Constraints
- Split Proposals into Short term / Midterm
- Switch Lab Diagram to graph LR (left-to-right fits the
  Internet→VPS→Firewall→Lab flow and uses vertical space better)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/infrastruktur/labdesign.md

@@ -3,6 +3,10 @@ marp: true
 pagination: true
 ---
 
+<style>
+.mermaid svg { max-width: 100% !important; height: auto !important; }
+</style>
+
 # Introduction
 
 This is assorted notes on what could go into the MakerFLOSS lab
@@ -16,17 +20,18 @@ This is assorted notes on what could go into the MakerFLOSS lab
 - A place where errors are not causing IP loss
   - even if errors are real big !!
 
-
 ## More details
 
-- firewalled off from production network of Maker Space
-- accessible from outside
-- potential for exposing services externally 
+- Firewalled off from the production network
+- Accessible from outside
+- Potential for exposing services externally
 
-## Non functions
+---
+
+## Constraints
 
 - Cost conscious
-- support constant change
+- Support constant change
 
 ---
 
@@ -36,17 +41,19 @@ This is assorted notes on what could go into the MakerFLOSS lab
 
 A VPS in a (European) cloud with one public IP
 
+---
+
 ## Midterm
 
-Complement the VPS with some local Hardware. This include
+Complement the VPS with some local hardware:
 
-- Firewall with zones implemented using VLANs, DNS/DHCP
+- Firewall with zones (VLANs, DNS/DHCP)
 - Netbird access to services in Lab
-- switching infrastructure
-- a primary "stable" proxmox host
-- a seconday experimentation machine
-- a Backup server
-- Use a tunnel to establish external access via public IP on VPS
+- Switching infrastructure
+- A primary "stable" Proxmox host
+- A secondary experimentation machine
+- A backup server
+- Tunnel for external access via VPS public IP
 
 ---
 
@@ -60,7 +67,7 @@ Complement the VPS with some local Hardware. This include
 ### Lab Diagram
 
 ```mermaid
-graph TB
+graph LR
     subgraph External
         Internet[🌐 Internet]
         VPS[FLOSS VPS<br/>88.99.32.236]