Update various docs (#4)

* rename cli tool

* remove redundant docs

* update docs

* update macos instructions

* add badges

docs/development/data-components.md

@@ -0,0 +1,32 @@
+The data & data structure components include:
+
+- The `Document` class.
+- The document store.
+- The vector store.
+
+### Data Loader
+
+- PdfLoader
+- Layout-aware with table parsing PdfLoader
+
+  - MathPixLoader: To use this loader, you need MathPix API key, refer to [mathpix docs](https://docs.mathpix.com/#introduction) for more information
+  - OCRLoader: This loader uses lib-table and Flax pipeline to perform OCR and read table structure from PDF file (TODO: add more info about deployment of this module).
+  - Output:
+
+    - Document: text + metadata to identify whether it is table or not
+
+      ```
+      - "source": source file name
+      - "type": "table" or "text"
+      - "table_origin": original table in markdown format (to be feed to LLM or visualize using external tools)
+      - "page_label": page number in the original PDF document
+      ```
+
+### Document Store
+
+- InMemoryDocumentStore
+
+### Vector Store
+
+- ChromaVectorStore
+- InMemoryVectorStore