remove sections of API docs that are not yet relevant

spring-ai-docs/src/main/antora/modules/ROOT/nav.adoc

@@ -3,15 +3,10 @@
 * xref:getting-started.adoc[Getting Started]
 * xref:api/index.adoc[]
 ** xref:api/aiclient.adoc[]
-** xref:api/models.adoc[]
 ** xref:api/prompt.adoc[]
-** xref:api/prompt-template.adoc[]
 ** xref:api/output-parser.adoc[]
-** xref:api/chains.adoc[]
-** xref:api/documentreaders.adoc[]
-** xref:api/splitters.adoc[]
+** xref:api/etl-pipeline.adoc[]
 ** xref:api/embeddings.adoc[]
 ** xref:api/vectordbs.adoc[]
-** xref:api/evaluators.adoc[]
 * Appendices
 ** xref:glossary.adoc[]

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chains.adoc

@@ -1,3 +0,0 @@
-= Chains
-
-TBD

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/evaluators.adoc

@@ -1,3 +0,0 @@
-= Evaluators
-
-TBD

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/models.adoc

@@ -1,3 +0,0 @@
-= Models
-
-TBD

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/prompt-template.adoc

@@ -1,3 +0,0 @@
-= Prompt Templates
-
-TBD

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/splitters.adoc

@@ -1,3 +0,0 @@
-= Splitters
-
-TBD