Add embed-links to how-to videos for PostgreSQL and SharePoint (#297)

Author: Paul-Cornell

snippets/general-shared-text/postgresql.mdx

@@ -1,4 +1,16 @@
-The PostgreSQL prerequisites:
+The PostgreSQL prerequisites, which include the following settings.
+
+The following video shows for example how to get these settings by using [Amazon RDS for PostgreSQL](https://aws.amazon.com/rds/postgresql/).
+
+<iframe
+width="560"
+height="315"
+src="https://www.youtube.com/embed/QuIlEimejDs"
+title="YouTube video player"
+frameborder="0"
+allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+allowfullscreen
+></iframe>
 
 - A PostgreSQL instance. [Install PostgreSQL](https://www.postgresql.org/docs/current/tutorial-install.html). 
 - The host name and port number for the instance. These values are in the `postgresql.conf` file's `listen_addresses` and `port` settings. This file should be on the same machine as the instance. These values might also already be set as environment variables named `PGHOST` and `PGPORT` on the same machine as the instance. 

snippets/general-shared-text/sharepoint.mdx

@@ -1,4 +1,14 @@
-The SharePoint prerequisites:
+The SharePoint prerequisites, which include the following settings.
+
+<iframe
+width="560"
+height="315"
+src="https://www.youtube.com/embed/r4BLhGgpAWQ"
+title="YouTube video player"
+frameborder="0"
+allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+allowfullscreen
+></iframe>
 
 - The SharePoint site URL.
 
@@ -9,28 +19,4 @@ The SharePoint prerequisites:
   [Learn more](https://learn.microsoft.com/microsoft-365/community/query-string-url-tricks-sharepoint-m365).
 
 - The path in the SharePoint site from which to start parsing files, for example `"Shared Documents"`. If the connector is to process all sites within the tenant, this filter will be applied to all site document libraries.
-- A SharePoint application (client) ID, along with its client secret with access permissions to the SharePoint instance. [Get a client ID and client secret, and set access permissions](https://github.com/vgrem/Office365-REST-Python-Client/wiki/How-to-connect-to-SharePoint-Online-and-and-SharePoint-2013-2016-2019-on-premises--with-app-principal).
-
-  <iframe
-  width="560"
-  height="315"
-  src="https://www.youtube.com/embed/Tn-jB7vdnOE"
-  title="YouTube video player"
-  frameborder="0"
-  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
-  allowfullscreen
-  ></iframe>
-
-{/*
-- To process per-file access permissions, an associated Azure application (client) ID, along with its correpsonding directory (tenant) ID and client secret with access to the backing Azure account for SharePoint. [Get a client ID, tenant ID, and client secret, and set access permissions](https://tsmatz.wordpress.com/2016/10/07/application-permission-with-v2-endpoint-and-microsoft-graph/).
-
-  <iframe
-  width="560"
-  height="315"
-  src="https://www.youtube.com/embed/GmWejAg2cfA"
-  title="YouTube video player"
-  frameborder="0"
-  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
-  allowfullscreen
-  ></iframe>
-*/}
+- A SharePoint app principal with it application (client) ID, client secret, and access permissions to the SharePoint instance. [Get a client ID and client secret, and set access permissions](https://github.com/vgrem/Office365-REST-Python-Client/wiki/How-to-connect-to-SharePoint-Online-and-and-SharePoint-2013-2016-2019-on-premises--with-app-principal).