Update README.md

Point Open in MATLAB Online buttons to new `internal` location of `README.mlx`

Author: vijayiyer05

README.md

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-[![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=emeyers/Brain-Observatory-Toolbox&file=%2Bbot/README.mlx)  [![View Brain-Observatory-Toolbox on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/90900-brain-observatory-toolbox)
+[![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=emeyers/Brain-Observatory-Toolbox&file=%2Bbot/%2binternal/README.mlx)  [![View Brain-Observatory-Toolbox on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/90900-brain-observatory-toolbox)
 
 # Brain Observatory Toolbox
 A MATLAB toolbox for accessing and using the neural recording public datasets from the **Allen Brain Observatory**[^1]. 
 
-🗺️ [**Open in MATLAB Online**](https://matlab.mathworks.com/open/github/v1?repo=emeyers/Brain-Observatory-Toolbox&file=%2Bbot/README.mlx)  to get oriented and get started with **3 lines of code**.
+🗺️ [**Open in MATLAB Online**](https://matlab.mathworks.com/open/github/v1?repo=emeyers/Brain-Observatory-Toolbox&file=%2Bbot/%2binternal/README.mlx)  to get oriented and get started with **3 lines of code**.
 
 Several **live script examples**  are available to guide new users, including **_demos_** of neural data analysis & **_tutorials_** covering Brain Observatory Toolbox concepts & operations.