Unable to build the Content docs on MacOs

**Describe the bug**
I can't run `dotnet fornax build` or `dotnet fornax watch` successfully in the `docs` folder of the `Content` template on MacOS.

**To Reproduce**
1. Clone repo and cd to Content
2. run `dotnet tool restore`
3. run `dotnet fake build` to ensure library is built
4. cd to `docs`
5. run `dotnet fornax build`
6. The build errors with something like

```
➜ docs git:(doubleslash) ✗ dotnet fornax watch
LOADER ERROR: Load Errors: [|/Users/chethusk/oss/Waypoint/Content/docs/loaders/literalloader.fsx (116,43)-(116,55) typecheck error The value, namespace, type or module 'PostCategory' is not defined. Maybe you want one of the following:
Poster;
/Users/chethusk/oss/Waypoint/Content/docs/loaders/literalloader.fsx (119,7)-(119,11) typecheck error The record label 'file' is not defined.;
/Users/chethusk/oss/Waypoint/Content/docs/loaders/literalloader.fsx (139,26)-(139,44) typecheck error The record label 'disableLiveRefresh' is not defined.|]
Open Errors: [|input.fsx (1,6)-(1,19) typecheck error The namespace or module 'Literalloader' is not defined.|]
Get layout Errors: [|input.fsx (1,16)-(1,22) typecheck error The value or constructor 'loader' is not defined. Maybe you want one of the following:
Loading
Order|]
[14:01:33] multiple files generated in 113ms
[14:01:34] '/Users/chethusk/oss/Waypoint/Content/docs/_public/index.json' generated in 340ms
[14:01:34] '/Users/chethusk/oss/Waypoint/Content/docs/_public/explanations/some-post.html' generated in 422ms
[14:01:35] '/Users/chethusk/oss/Waypoint/Content/docs/_public/explanations/overview.html' generated in 684ms
[14:01:35] '/Users/chethusk/oss/Waypoint/Content/docs/_public/tutorials/some-post.html' generated in 504ms
[14:01:36] '/Users/chethusk/oss/Waypoint/Content/docs/_public/tutorials/how-to-start.html' generated in 419ms
[14:01:36] '/Users/chethusk/oss/Waypoint/Content/docs/_public/how-tos/somePostWithCode.html' generated in 421ms
[14:01:37] '/Users/chethusk/oss/Waypoint/Content/docs/_public/how-tos/diagrams.html' generated in 390ms
An unexpected error happend: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.Collections.Generic.KeyNotFoundException: An index satisfying the predicate was not found in the collection.
at Microsoft.FSharp.Collections.SeqModule.Find[T](FSharpFunc`2 predicate, IEnumerable`1 source) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 677
at FSI_0046.Page.generate'(SiteContents ctx, String page)
at lambda_method(Closure , Unit , SiteContents , String , String )
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Generator.EvaluatorHelpers.helper@54(Object next, FSharpList`1 args) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 64
at Generator.EvaluatorHelpers.invokeFunction(Object f, IEnumerable`1 args) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 68
at Generator.GeneratorEvaluator.evaluate@175-1.Invoke(FsiValue ft) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 178
at Microsoft.FSharp.Core.ResultModule.Bind[T,TResult,TError](FSharpFunc`2 binder, FSharpResult`2 result) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\result.fs:line 15
at Generator.GeneratorEvaluator.evaluate(FsiEvaluationSession fsi, SiteContents siteContent, String generatorPath, String projectRoot, String page) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 175
at Generator.generate(FsiEvaluationSession fsi, Config cfg, SiteContents siteContent, String projectRoot, String page) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 321
at Generator.action@1(String projectRoot, FsiEvaluationSession fsi, Config config, SiteContents sc, String filePath) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 479
at Generator.generateFolder(String projectRoot, Boolean isWatch) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Generator.fs:line 478
at Fornax.guardedGenerate@168(String cwd, Unit unitVar0) in D:\Programowanie\Projekty\Ionide\Fornax\src\Fornax\Fornax.fs:line 170

```

I think the problem here is that the literal loader can't typecheck correctly, which causes a fault in the page generator later on.

**Expected behaviour**
The api, content, and search docs are all build.

**Environment (please complete the following information):**
- OS: macos catalina
- dotnet SDK version: 3.1.300