feat: Organized the directories and add a few options example jupyter notebooks (#569)

* feat: Organized the directories and add a few options example jupyter notebooks.

* Replaced the stock notebook, organized the directories, and add a few options example jupyter notebooks and README.md.

* Updated Jupyter notebooks and reorganized directories

* Updated Jupyter notebooks and reorganized directories

* Updated Jupyter notebooks and reorganized directories (deleted all the codes in existing Jupyter Notebooks and leave the important notice.)

* Updated Jupyter notebooks and reorganized directories (added a note in every Jupyter notebook linking to its article)

* Updated Jupyter notebooks and reorganized directories

* Updated Jupyter notebooks and reorganized directories (improved root README.md, examples/README.md, and sub-directories/README.md; improved their relationships)

* Updated sub-directories README.md.

* Updated the delta hedging notebooks and READMEs.

* Try fixing the a case sensitivity issue of sub-directories names with Git.

* Try fixing the a case sensitivity issue of sub-directories names with Git. Renamed the temp sub-directories names back to the non-capitalized ones.

* Try fixing the a case sensitivity issue of sub-directories names with Git. Renamed the temp sub-directories names back to the non-capitalized ones.

Author: idsts2670

README.md

@@ -262,13 +262,13 @@ For more details, please refer to [our documentation page for options trading](h
 
 There is an example jupyter notebook to explain methods of alpaca-py for options trading.
 
-* [jupyter notebook: options trading basic example with alpaca-py](https://github.com/alpacahq/alpaca-py/blob/master/examples/options-trading-basic.ipynb)
+* [jupyter notebook: options trading basic example with alpaca-py](https://github.com/alpacahq/alpaca-py/blob/master/examples/options/options-trading-basic.ipynb)
 
 ### Jupyter Notebook Library <a name="colab-library"></a>
 
-We have put together some examples in jupyter notebooks so that you can start developing today with alpaca-py right away!
+Explore examples for stocks, options, and crypto using alpaca-py. Notebooks for each asset class are provided in their respective directories!
 
-* [Stocks](https://github.com/alpacahq/alpaca-py/blob/master/examples/stocks-trading-basic.ipynb)
-* [Options](https://github.com/alpacahq/alpaca-py/blob/master/examples/options-trading-basic.ipynb)
-* [Crypto](https://github.com/alpacahq/alpaca-py/blob/master/examples/crypto-trading-basic.ipynb)
-* [Multi-Leg Options](https://github.com/alpacahq/alpaca-py/blob/master/examples/options-trading-mleg.ipynb)
+* [Stocks](https://github.com/alpacahq/alpaca-py/blob/master/examples/stocks/README.md)
+* [Crypto](https://github.com/alpacahq/alpaca-py/blob/master/examples/crypto/README.md)
+* [Options](https://github.com/alpacahq/alpaca-py/blob/master/examples/options/README.md)
+* [Multi-Leg Options](https://github.com/alpacahq/alpaca-py/blob/master/examples/options/README.md)

examples/README.md

@@ -1,11 +1,10 @@
 ## Google Colab Notebooks
 
-Explore the examples for Stocks, Options, and Crypto utilizing alpaca-py in the notebooks provided below. Open them in
-Google Colab to jumpstart your development journey!
+Explore examples for stocks, options, and crypto using alpaca-py. Notebooks for each asset class are provided in their respective directories!
 
-| Notebooks                                       |                                                                                    Open in Google Colab                                                                                    |
-|:------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|
-| [Stocks](stocks-trading-basic.ipynb)            | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/alpacahq/alpaca-py/blob/master/examples/stocks-trading-basic.ipynb)  |
-| [Options](options-trading-basic.ipynb)          | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/alpacahq/alpaca-py/blob/master/examples/options-trading-basic.ipynb) |
-| [Crypto](crypto-trading-basic.ipynb)            | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/alpacahq/alpaca-py/blob/master/examples/crypto-trading-basic.ipynb)  |
-| [Multi-Leg Options](options-trading-mleg.ipynb) | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/alpacahq/alpaca-py/blob/master/examples/options-trading-mleg.ipynb)  |
+| Directories                                  |
+|:---------------------------------------------|
+| [Stocks](stocks/README.md)                   |
+| [Crypto](crypto/README.md)                   |
+| [Options](options/README.md)           |
+| [Multi-Leg Options](options/README.md)       |