Add missing assets and update links

Author: raghavbali

docs/assets/dspy_banner.png

@@ -16,7 +16,7 @@
    },
    "source": [
     "# Retrieval Augmented LLM App\n",
-    "<img src=\"./assets/rap_banner.jpeg\">\n",
+    "<img src=\"../assets/rap_banner.jpeg\">\n",
     "\n",
     "We have covered quite some ground in terms of understanding and building components for:\n",
     "- Text Representation\n",

docs/assets/dspy_logo.png

@@ -16,9 +16,9 @@
    "id": "8ed0667c-fe9b-45b4-83b3-2ad4ead66225",
    "metadata": {},
    "source": [
-    "# <img src=\"./assets/dspy_logo.png\" width=\"2%\"> DSPy: Beyond Prompting\n",
+    "# <img src=\"../assets/dspy_logo.png\" width=\"2%\"> DSPy: Beyond Prompting\n",
     "---\n",
-    "<img src=\"./assets/dspy_banner.png\">\n",
+    "<img src=\"../assets/dspy_banner.png\">\n",
     "\n",
     "---\n",
     "\n",
@@ -50,7 +50,7 @@
    "metadata": {},
    "source": [
     "### Usual Prompt Based Workflow\n",
-    "<img src=\"./assets/prompt_workflow.png\" width=\"75%\">\n",
+    "<img src=\"../assets/prompt_workflow.png\" width=\"75%\">\n",
     "\n",
     "---\n"
    ]
@@ -62,7 +62,7 @@
    "source": [
     "### LangChain-Like Workflow\n",
     "\n",
-    "<img src=\"./assets/langchain_workflow.png\" width=\"75%\">\n",
+    "<img src=\"../assets/langchain_workflow.png\" width=\"75%\">\n",
     "\n",
     "---\n"
    ]
@@ -74,7 +74,7 @@
    "source": [
     "### DSpy Workflow\n",
     "\n",
-    "<img src=\"./assets/dspy_workflow.png\" >\n",
+    "<img src=\"../assets/dspy_workflow.png\" >\n",
     "\n",
     "---\n"
    ]