Add in Portfolio Optimization, Dark Pools, Discovery and Comparison Guides (#1887)

* commit

* commit

* Corrected typo in the index list, and added Thailand, Philippines, Wilshire US Large Cap Growth and Value, MOVE Index

* update to index list

* commit

* commit

* Corrected typo in the index list, and added Thailand, Philippines, Wilshire US Large Cap Growth and Value, MOVE Index

* guides: behavioural anaylsis & trading hours

* linter

* Add in Portfolio Optimization, Dark Pools, Discovery and Comparison Guides

* Update _index.md

* Update _index.md

* Update _index.md

* Remove images

* Some small improvements

* Update _index.md

* Add GIF

* ABC

* Add files via upload

* Fix small mistake

* Remove installer explanation since it is better documented in Hugo

* Small fix

Co-authored-by: Danglewood <85772166+deeleeramone@users.noreply.github.com>
Co-authored-by: didierlopes.eth <dro.lopes@campus.fct.unl.pt>
Co-authored-by: james <jmaslek11@gmail.com>

README.md

@@ -95,7 +95,7 @@ As a modern Python-based environment, OpenBBTerminal opens access to numerous Py
 
 If you wish to install the Terminal, there are currently four options:
 
-- [Using the Installer](openbb_terminal/README.md#User) (recommended if you just want to use the terminal)
+- [Using the Installer](https://openbb-finance.github.io/OpenBBTerminal/terminal/#accessing-the-openbb-terminal) (recommended if you just want to use the terminal)
 - [Using Python](openbb_terminal/README.md#anaconda--python) (recommended if you want to develop new features)
 - [Using Docker](openbb_terminal/README.md#Docker-Installation) (alternative option to the installer if preferred)
 - [Using Docker Web UI](openbb_terminal/README.md#web-ui---docker) (if you want to deploy the web UI for users to access