fix(docs): update links in OpenTelemetry self-hosted guide for Grafana and Jaeger

Corrected the links in the OpenTelemetry self-hosted guide to point to the appropriate Markdown files for the Grafana Stack and Jaeger setup. This ensures users are directed to the correct resources for configuring their self-hosted observability solutions.

Author: robinbraemer

.web/docs/.vitepress/config.ts

@@ -194,7 +194,7 @@ export default defineConfig({
                 },
                 {
                   text: 'Self-hosted Grafana Stack',
-                  link: '/guide/otel/self-hosted/',
+                  link: '/guide/otel/self-hosted/grafana-stack.md',
                 },
                 {
                   text: 'Grafana Dashboards',

.web/docs/guide/otel/index.md

@@ -62,8 +62,8 @@ You can use various solutions to collect and visualize OpenTelemetry data. Here
 
 - [Grafana Cloud](/guide/otel/grafana-cloud/) - Fully managed observability platform with support for metrics, logs, and traces
 - [Honeycomb](/guide/otel/honeycomb/) - Observability platform designed for debugging complex systems
-- [Self-hosted Grafana Stack](/guide/otel/self-hosted/grafana-stack/) - Run your own OpenTelemetry collector and visualize data with Grafana
-- [Self-hosted Jaeger](/guide/otel/self-hosted/jaeger/) - Run your own Jaeger for tracing
+- [Self-hosted Grafana Stack](/guide/otel/self-hosted/grafana-stack.md) - Run your own OpenTelemetry collector and visualize data with Grafana
+- [Self-hosted Jaeger](/guide/otel/self-hosted/jaeger.md) - Run your own Jaeger for tracing
 
 :::