Html page redesign (#242)

* HTML sample page redesign v1

* v1

* added endpoint descriptions

* improved streaming scenario detection

* adapted request and response handling to new backend

* Makes sample app work with new endpoint

* Minor improvements

* minor change to descriptions

Co-authored-by: Roshin Rajan Panackal <36329474+rpanackal@users.noreply.github.com>

* minor change to descriptions

Co-authored-by: Roshin Rajan Panackal <36329474+rpanackal@users.noreply.github.com>

* minor change to endpoint description

Co-authored-by: Roshin Rajan Panackal <36329474+rpanackal@users.noreply.github.com>

* minor change to descriptions

Co-authored-by: Roshin Rajan Panackal <36329474+rpanackal@users.noreply.github.com>

* update of orchestration endpoint description to "LLM" instead of "OpenAI"

* update of orchestration controller JavaDocs to "LLM" instead of "OpenAI"

---------

Co-authored-by: I750911 <till.kurek@sap.com>
Co-authored-by: Alexander Dümont <alexander_duemont@web.de>
Co-authored-by: Jonas Israel <jonas.israel@sap.com>
Co-authored-by: Roshin Rajan Panackal <36329474+rpanackal@users.noreply.github.com>

sample-code/spring-app/src/main/java/com/sap/ai/sdk/app/controllers/OrchestrationController.java

@@ -33,7 +33,7 @@ class OrchestrationController {
       new ObjectMapper().setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
 
   /**
-   * Chat request to OpenAI through the Orchestration service with a simple prompt.
+   * Chat request to an LLM through the Orchestration service with a simple prompt.
    *
    * @return a ResponseEntity with the response content
    */
@@ -52,7 +52,7 @@ ResponseEntity<String> completion(
   }
 
   /**
-   * Asynchronous stream of an OpenAI chat request
+   * Asynchronous stream of an LLM chat request
    *
    * @return the emitter that streams the assistant message response
    */
@@ -81,7 +81,7 @@ ResponseEntity<ResponseBodyEmitter> streamChatCompletion() {
   }
 
   /**
-   * Chat request to OpenAI through the Orchestration service with a template.
+   * Chat request to an LLM through the Orchestration service with a template.
    *
    * @link <a href="https://help.sap.com/docs/sap-ai-core/sap-ai-core-service-guide/templating">SAP
    *     AI Core: Orchestration - Templating</a>
@@ -102,7 +102,7 @@ ResponseEntity<Object> template(
   }
 
   /**
-   * Chat request to OpenAI through the Orchestration service using message history.
+   * Chat request to an LLM through the Orchestration service using message history.
    *
    * @return a ResponseEntity with the response content
    */
@@ -172,7 +172,7 @@ ResponseEntity<String> maskingAnonymization(
   }
 
   /**
-   * Chat request to OpenAI through the Orchestration deployment under a specific resource group.
+   * Chat request to an LLM through the Orchestration deployment under a specific resource group.
    *
    * @return a ResponseEntity with the response content
    */