Documentation small fixes (#591)

* Move 'Why Cubed?' out of Getting Started section

* Update the Python Array Page to link to the coverage status page

* Remove executor API docs as users now create executors via configuration settings (documented on the configuration page)

docs/api.rst

@@ -83,18 +83,3 @@ Runtime
     Spec
     TaskEndEvent
     measure_reserved_mem
-
-Executors
-=========
-
-.. currentmodule:: cubed.runtime.executors
-.. autosummary::
-    :nosignatures:
-    :toctree: generated/
-
-    local.SingleThreadedExecutor
-    local.ThreadsExecutor
-    local.ProcessesExecutor
-    beam.BeamExecutor
-    lithops.LithopsExecutor
-    modal.ModalExecutor

docs/array-api.md

@@ -1,30 +1,9 @@
 # Python Array API
 
-Cubed implements version 2022.12 of the [Python Array API standard](https://data-apis.org/array-api/2022.12/index.html) in `cubed.array_api`, with a few exceptions noted below. Refer to its [API specification](https://data-apis.org/array-api/2022.12/API_specification/index.html) for API documentation.
-
-The [linear algebra extensions](https://data-apis.org/array-api/2022.12/extensions/linear_algebra_functions.html) and [Fourier transform functions¶](https://data-apis.org/array-api/2022.12/extensions/fourier_transform_functions.html) are *not* supported.
+Cubed implements version 2022.12 of the [Python Array API standard](https://data-apis.org/array-api/2022.12/index.html) in `cubed.array_api`, with a few exceptions listed on the [coverage status](https://github.com/cubed-dev/cubed/blob/main/api_status.md) page. The [Fourier transform functions](https://data-apis.org/array-api/2022.12/extensions/fourier_transform_functions.html) are *not* supported.
 
 Support for version [2023.12](https://data-apis.org/array-api/2023.12/index.html) is tracked in Cubed issue [#438](https://github.com/cubed-dev/cubed/issues/438).
 
-## Missing from Cubed
-
-The following parts of the standard are not implemented:
-
-| Category               | Object/Function  |
-| ---------------------- | ---------------- |
-| Array object           | In-place Ops     |
-| Creation Functions     | `from_dlpack`    |
-| Indexing               | Boolean array    |
-| Searching Functions    | `nonzero`        |
-| Set Functions          | `unique_all`     |
-|                        | `unique_counts`  |
-|                        | `unique_inverse` |
-|                        | `unique_values`  |
-| Sorting Functions      | `argsort`        |
-|                        | `sort`           |
-| Statistical Functions  | `std`            |
-|                        | `var`            |
-
 ## Differences between Cubed and the standard
 
 The following [Creation Functions](https://data-apis.org/array-api/latest/API_specification/creation_functions.html) accept extra `chunks` and `spec` keyword arguments:

docs/index.md

@@ -25,6 +25,7 @@ Examples <https://github.com/tomwhite/cubed/tree/main/examples/README.md>
 api
 array-api
 configuration
+why-cubed
 related-projects
 ```