Website: add some documentation about the storage options

Basically it's "simple, efficient, isolated -- pick two".

web/project-website/content/usage/shared-storage/_index.md

@@ -5,7 +5,29 @@ title: Shared Storage
 Flamenco needs some form of *shared storage*: a place for files to be stored
 that can be accessed by all the computers in the farm.
 
-TODO: write more about this.
+Basically there are three approaches to this:
+
+| Approach                            | Simple | Efficient | Render jobs are isolated |
+|-------------------------------------|--------|-----------|--------------------------|
+| Work directly on the shared storage | ✅      | ✅         | ❌                        |
+| Create a copy for each render job   | ✅      | ❌         | ✅                        |
+| Shaman Storage System               | ❌      | ✅         | ✅                        |
+
+Each is explained below.
+
+## Work Directly on the Shared Storage
+
+Working directly in the shared storage is the simplest way to work with Flamenco.
+
+## Creating a Copy for Each Render Job
+
+The "work on shared storage" approach has the downside that render jobs are not
+fully separated from each other. For example, when you change a texture while a
+render job is running, the subsequently rendered frames will be using that
+altered texture. If this is an issue for you, and you cannot use the [Shaman
+Storage System][shaman], the approach described in this section is for you.
+
+[shaman]: #shaman-storage-system
 
 ## Shaman Storage System
 
@@ -15,7 +37,19 @@ TODO: write
 
 ### Windows
 
-TODO: lots of tricky stuff about getting symlinks to work on Windows. We may want to get inspiration from the [Git-for-Windows](https://github.com/git-for-windows/git/wiki/Symbolic-Links#allowing-non-administrators-to-create-symbolic-links) documentation.
+The Shaman storage system uses _symbolic links_. On Windows the creation of
+symbolic links requires a change in security policy. Unfortunately, *Home*
+editions of Windows do not have a policy editor, but the freely available
+[Polsedit][polsedit] can be used on these editions.
+
+1. Press Win+R, in the popup type `secpol.msc`. Then click OK.
+2. In the _Local Security Policy_ window that opens, go to _Security Settings_ > _Local Policies_ > _User Rights Assignment_.
+3. In the list, find the _Create Symbolic Links_ item.
+4. Double-click the item and add yourself (or the user running Flamenco Manager or the whole users group) to the list.
+5. Log out & back in again, or reboot the machine.
+
+[polsedit]: https://www.southsoftware.com/polsedit.html
+
 
 ### Linux