Improve Pro documentation further (#5641)

* small improvement

* Fix TutorialVideo for mobile view

* main page terminal pro docs

* jose whelp

* placeholder index file that needs to be removed

* fix: fixes sidebar, removes unused index.md

* update link to api keys

* update api keys link

* fix hyperlinks in terminal helper

* fix a few more links

* fix some more links

* linter

* black linter

* improve main docs page for each product

* small refactor

* header to take to main page of product

* run OpenAI script to generate SEO for pro content

---------

Co-authored-by: jose-donato <43375532+jose-donato@users.noreply.github.com>

examples/googleColabInstallation.ipynb

@@ -1852,7 +1852,7 @@
       "cell_type": "code",
       "source": [
         "# The source for the data can be defined by using the `source` argument.\n",
-        "# Instructions for obtaining and entering API keys are found here: https://docs.openbb.co/sdk/usage/guides/api-keys\n",
+        "# Instructions for obtaining and entering API keys are found here: https://docs.openbb.co/sdk/usage/api-keys\n",
         "\n",
         "balance_sheet_growth = openbb.stocks.fa.balance(symbol, ratios = True).transpose()\n",
         "\n",
@@ -2488,4 +2488,4 @@
       ]
     }
   ]
-}
+}