docs: source observability adapter API specs from the openchoreo repo (#720)

The logs, metrics, and tracing adapter OpenAPI specs now live in the
openchoreo repo under openapi/. Point the SwaggerUI references at the
raw spec URLs there and drop the vendored copies from static/api-specs/
so the openchoreo repo is the single source of truth.

Signed-off-by: Akila-I <akila.99g@gmail.com>

Author: akila-i

docs/platform-engineer-guide/modules/observability-logging-adapter-api.mdx

@@ -12,4 +12,4 @@ This is the OpenAPI specification that a logging adapter must implement to integ
 
 For an overview of the adapter pattern and how it fits into the observability architecture, see [Building an Observability Module](../building-a-module#observability-modules).
 
-<SwaggerUI specUrl="/api-specs/observability-logs-adapter-api.yaml" />
+<SwaggerUI specUrl="https://raw.githubusercontent.com/openchoreo/openchoreo/main/openapi/observability-logs-adapter-api.yaml" />

docs/platform-engineer-guide/modules/observability-metrics-adapter-api.mdx

@@ -12,4 +12,4 @@ This is the OpenAPI specification that a metrics adapter must implement to integ
 
 For an overview of the adapter pattern and how it fits into the observability architecture, see [Building an Observability Module](../building-a-module#observability-modules).
 
-<SwaggerUI specUrl="/api-specs/observability-metrics-adapter.yaml" />
+<SwaggerUI specUrl="https://raw.githubusercontent.com/openchoreo/openchoreo/main/openapi/observability-metrics-adapter.yaml" />

docs/platform-engineer-guide/modules/observability-tracing-adapter-api.mdx

@@ -12,4 +12,4 @@ This is the OpenAPI specification that a tracing adapter must implement to integ
 
 For an overview of the adapter pattern and how it fits into the observability architecture, see [Building an Observability Module](../building-a-module#observability-modules).
 
-<SwaggerUI specUrl="/api-specs/observability-tracing-adapter-api.yaml" />
+<SwaggerUI specUrl="https://raw.githubusercontent.com/openchoreo/openchoreo/main/openapi/observability-tracing-adapter-api.yaml" />