Small improvement in the introduction (#150)

Author: Nirus2000

config/de/mkdocs.yml

@@ -101,8 +101,8 @@ markdown_extensions:
   - tables
 
 nav:
-  - Intro: 
-      - Intro: index.md
+  - Einleitung: 
+      - Einleitung: index.md
   - Erste Schritte:
       - Erste Schritte: erste-schritte/index.md
       - Installation: erste-schritte/installation.md

config/en/mkdocs.yml

@@ -99,8 +99,8 @@ markdown_extensions:
   - tables
 
 nav:
-  - Intro: 
-      - Intro: index.md
+  - Introduction: 
+      - Introduction: index.md
   - Getting started:
       - Getting started: getting-started/index.md
       - Installation: getting-started/installation.md

docs/de/index.md

@@ -1,13 +1,12 @@
 ---
 title: Einleitung
-template: home.html
 lastUpdate: 2025-05-03
 description: Dieses Handbuch führt in Portfolio Performance ein, erklärt Portfolioverwaltung, Performance-Berechnung (TWRR, interner Zinsfuß) und erste Schritte (Portfolio-Datei, Wertpapiere, Import). Es betont die Vorteile gegenüber Excel und ruft zur Mitarbeit auf. Struktur basiert auf Diataxis (Erste Schritte, Grundlagen, How-to, Referenz).
 authors:
     - name: Portfolio Performance Team
     - name: Nirus2000
 version: 1.0
-slug: system-overview
+slug: einleitung
 tags:
     - Portfolio Management
     - Investment Analysis

docs/en/index.md

@@ -1,13 +1,12 @@
 ---
 title: Introduction
-template: home.html
 lastUpdate: 2025-05-03
-description: This handbook provides a comprehensive introduction to Portfolio Performance, detailing its features for portfolio management and performance calculation (based on True-Time Weighted Rate of Return and internal rate of return). It includes a detailed guide for initial steps such as creating a portfolio file and securities, as well as importing transactions. Furthermore, it outlines the advantages over simple Excel calculations and encourages active participation in the handbook's further development. The handbook is divided into four chapters: First Steps, Basics, How-to, and Reference Manual, based on the Diataxis framework for documentation.
+description: This handbook introduces Portfolio Performance, explains portfolio management, performance calculation (TWRR, internal rate of return), and first steps (portfolio file, securities, import). It emphasizes the advantages over Excel and calls for collaboration. Structure is based on Diataxis (Getting Started, Fundamentals, How-to, Reference).
 authors:
     - name: Portfolio Performance Team
     - name: Nirus2000
 version: 1.0
-slug: system-overview
+slug: introduction
 tags:
     - Portfolio Management
     - Investment Analysis
@@ -17,8 +16,8 @@ changes:
     - date: 2025-05-03
       author: Nirus2000
       description:
-        - Adding YAML Source
-        - Base structure implemented
+        - Adding YAML source
+        - Basic structure implemented
 ---
 
 ## What is Portfolio Performance?