Initialize the Guides and fill in the Introduction to Stocks

[JerBouma]

This PR represents the initialization of the Guides page. Filling all these guides will together serve as a "OpenBB Terminal for Dummies" handbook explaining in much detail how the terminal works which should be answering much of the questions we receive and confusion about certain functionality.

In each of these pages we:

• Provide a brief overview of the menu and explain, if applicable, in detail how to use the commands within this menu
• Provide a brief description of every sub-menu on this page and have a link to the “Introduction to …” page, e.g. “Introduction to Options”.
• Provide one or two examples of how to use the menus functionalities on this page. This is not to explain what an analyst does or what you would do, it simply explains how to use some commands.

We keep in mind the following:

• We take a neutral position for everything we show. We don’t say things like ‘This is a good way to’ or ‘This is the gold standard’ or anything similar. These guides are not meant for any form of financial advice, conclusions or perceptions of the market.
• The page is formal. We don’t include any type of jokes, memes or sarcasm/rhetoric comments.
• We do not explain any financial term but refer to a different source, e.g. Investopedia.
• The purpose of the guide is not to educate the user about how to invest but to explain how to navigate a menu.

Please look at _introduction_to_stocks.md for an example of how we could describe a menu. Please note that this is a top level menu and sub level menus (e.g. Fundamental Analysis within Stocks) should slightly differ.

I am inviting @deeleeramone and @minhhoang1023 (see Jira) and anyone else interested in writing guides to fill these in keeping in mind the general rules and formatting that apply to each document.

[JerBouma]

@DidierRLopes Why does something completely unrelated fails?

[DidierRLopes]

@DidierRLopes Why does something completely unrelated fails?

Not sure tbh. But it works most of the times when you re-run