docs: add content to all section index pages

Signed-off-by: Moritz Wiesinger <[email protected]>

docs-new/docs/components/index.md

@@ -2,23 +2,9 @@
 
 ## Keptn Components
 
-Keptn consists of two main components:
+Keptn consists of the following main components:
 
-* Keptn Lifecycle Operator, which splits into two separate operators
-  in Release 0.7.0 and later:
-  * Lifecycle-Operator
-  * Metrics-Operator
-* Keptn Lifecycle Scheduler
-
-```mermaid
-graph TD;
-    KeptnComponents-->Operators;
-    KeptnComponents-->Scheduler
-   Operators-->Lifecycle-Operator
-   Operators-->Metrics-Operator
-style KeptnComponents fill:#006bb8,stroke:#fff,stroke-width:px,color:#fff
-style Operators fill:#d8e6f4,stroke:#fff,stroke-width:px,color:#006bb8
-style Scheduler fill:#d8e6f4,stroke:#fff,stroke-width:px,color:#006bb8
-style Lifecycle-Operator fill:#d8e6f4,stroke:#fff,stroke-width:px,color:#006bb8
-style Metrics-Operator fill:#d8e6f4,stroke:#fff,stroke-width:px,color:#006bb8
-```
+* [Keptn Lifecycle Operator](./lifecycle-operator)
+* [Keptn Metrics Operator](./metrics-operator.md)
+* [Keptn Scheduler](./scheduling.md)
+* [Keptn Certificate Manager](./certificate-operator.md)

docs-new/docs/getting-started/index.md

@@ -1 +1,3 @@
 # Get started
+
+This section will guide you through some tutorials that show how to bootstrap and use Keptn.

docs-new/docs/guides/index.md

@@ -1 +1,3 @@
 # Guides
+
+This section will help you with guides about specific features of Keptn.

docs-new/docs/index.md

@@ -1,3 +1,8 @@
 # Keptn Documentation
 
 This is the documentation homepage.
+If you are new to Keptn, please check out the following sections:
+
+- [Core Concepts](./core-concepts) will help you understand what Keptn is all about
+- [Get Started](./getting-started) will help you get going with your first use cases for Keptn
+- [Installation](./installation) will guide you through the installation procedure of Keptn

docs-new/docs/reference/index.md

@@ -1,3 +1,8 @@
 # Reference
 
-This section of the Keptn documentation contains reference documentation.
+This section of the Keptn documentation contains reference documentation for the various APIs and CRDs that are used in Keptn.
+
+If you want to learn more about specific Custom Resource Definitions, go to the [CRD Reference](./crd-reference) section.
+
+If you want to look up some specific object properties or want ot know more about the internal APIs of Keptn,
+Go to the [API Reference](./api-reference) section.

docs-new/docs/use-cases/index.md

@@ -1 +1,3 @@
 # Use Cases
+
+This section contains specific use cases and integration scenarios with other Cloud Native tools.