Fixes#9549
* Not a full UE pass on the group of external provider topics ... don't quite have time for that right now. However, I do hit a number of small UE-type updates.
* Engineering: You only need to look at one thing here: See the *forwarded-headers-middleware.md* file. The content of the file is below. The INCLUDE is linked into the external auth provider topics to surface Forwarded Headers Middleware (proxy/LB topic).
> \#\# Forward request information with a proxy or load balancer
>
> If the app is deployed behind a proxy server or load balancer, some of the original request information might be forwarded to the app in request headers. This information usually includes the secure request scheme (\`https\`), host, and client IP address. Apps don't automatically read these request headers to discover and use the original request information.
>
> The scheme is used in link generation that affects the authentication flow with external providers. Losing the secure scheme (\`https\`) results in the app generating incorrect insecure redirect URLs.
>
> Use Forwarded Headers Middleware to make the original request information available to the app for request processing.
>
> For more information, see \<xref:host-and-deploy/proxy-load-balancer>.
If it's easier to provide feedback in a comment here over hunting down the file on the diff, that works for me.
* overview
* whats new to end
* fix migration node
* split fundamentals, move to end
* glob & loc, get started
* security node name
* security section
* azure, client-side, host
* several more sections
* redistribute tutorials
* proofread fixes
* move how to download section
* index files delete and redirect
* fix errors
* reorder some nodes
* scott feedback, flatten main tutorials node
* fix missed feedback items + other issues
* unflatten tutorials node
* move 'how to download'
* more tutorials node tweaks
* standardize view sample links
* db --> DB
* fix build error
* remove link from a parent node
* streamline node names
* xref links
* typos
* typo
* typos and revert some xref links
* scott feedback
* scott feedback
* feedback
* change node name
* safe storage-->protect
Addresses #8579
I might be getting the hang of **_find and replace_** now. 😝
This doesn't touch a couple that ref 2.2.0. I'll tidy those up on https://github.com/aspnet/Docs/issues/8518 after 2.2 RTM.
Tom Dykstra
Luke Latham
BinaryBrain
Nick Schonning
Matt Spicer
Pavel Krymets
Kevinio04
Rick Anderson
Maxim Kornilov