Add configs to VectorDB docs (#1699)

docs/components/vectordbs/overview.mdx

@@ -0,0 +1,24 @@
+---
+title: Overview
+---
+
+Mem0 includes built-in support for various popular databases. Memory can utilize the database provided by the user, ensuring efficient use for specific needs.
+
+## Usage
+
+To utilize a vector database, you must provide a configuration to customize its usage. If no configuration is supplied, a default configuration will be applied, and `Qdrant` will be used as the vector database.
+
+For a comprehensive list of available parameters for vector database configuration, please refer to [Config](./config).
+
+To view all supported vector databases, visit the [Supported Vector Databases](./dbs).
+
+## Common issues
+
+### Using model with different dimensions
+
+If you are using customized model, which is having different dimensions other than 1536
+for example 768, you may encounter below error:
+
+`ValueError: shapes (0,1536) and (768,) not aligned: 1536 (dim 1) != 768 (dim 0)`
+
+you could add `"embedding_model_dims": 768,` to the config of the vector_store to overcome this issue.