Add WIP warnings.

Author: nedtwigg

Diff for: selfie.dev/src/pages/py/index.mdx

@@ -7,6 +7,8 @@ export const description = "Zero-config inline and disk snapshots for Python. Fe
 
 <NavHeading text="literal" popout="/py/get-started#quickstart" />
 
+## NOT READY YET - WIP
+
 This is a reasonable way to test.
 
 ```python
@@ -48,6 +50,8 @@ And from now on it's a proper assertion, but you didn't have to spend any time w
 
 <NavHeading text="like-a-filesystem" popout="/py/get-started#disk" />
 
+## NOT READY YET - WIP
+
 That `primesBelow(100)` snapshot above is almost too long. Something bigger, such as `primesBelow(10_000)` is definitely too big. To handle this, selfie lets you put your snapshots on disk.
 
 ```python
@@ -89,6 +93,8 @@ You can treat your snapshot files as an output deliverable of your code, and use
 
 <NavHeading text="lensable" popout="/py/facets" />
 
+## NOT READY YET - WIP
+
 A problem with the snapshots we've shown so far is that they are one dimensional. What about headers and cookies? What about the content the user actually sees, without all the markup? What if we could do this? 
 
 ```
@@ -141,6 +147,8 @@ See the [facets section](/py/facets) for more details on how you can use Selfie
 
 <NavHeading text="cacheable" popout="/py/cache" />
 
+## NOT READY YET - WIP
+
 Sometimes a test has a component which is slow, expensive, or non-deterministic. In cases like this, it can be useful to save the result of a previous execution of the API call, and use that as a mock for future tests.
 
 ```python