docs: clean up old docs

documentation/topics/atomics.md

@@ -1,37 +0,0 @@
-# Atomics
-
-Atomics allow you to attach expression-based changes to changesets, to be executed in the data layer when the action is performed.
-
-For example:
-
-```elixir
-update :increment_score do
-  argument :points, :integer, allow_nil?: false
-  change atomic_update(:score, expr(score + ^arg(:points)))
-end
-```
-
-## What is supported
-
-- Atomics are only supported in update actions and upserts. In the case of upserts, the atomic changes are only applied in the case of a conflicting record.
-- Attaching atomics to an action using the `atomic_update/2` change in the action, as shown in the example below.
-- Attaching atomics to a changeset manually with `Ash.Changeset.atomic_update/3`
-- Using calculations that don't refer to aggregates or related values in expressions
-
-### Manually attached
-
-```elixir
-changeset
-|> Ash.Changeset.atomic_update(:score, Ash.Expr.expr(score + 1))
-|> Ash.update!()
-```
-
-### Upsert example
-
-```elixir
-create :upsert do
-  upsert? true
-  change set_attribute(:points, 1) # set to 1
-  set_on_upsert :points, expr(points + 1) # or increment existing
-end
-```

documentation/topics/development/upgrading-to-3.0.md

@@ -574,7 +574,7 @@ On `:update` actions, and `:destroy` actions, they now default to `require_atomi
 3. the action has a manual implementation
 4. the action has applicable notifiers that require the original data.
 
-Updates and destroys that can be made fully atomic are always safe to do concurrently, and as such we now require that actions meet this criteria. See the [atomics guide](/documentation/topics/atomics.md) for more.
+Updates and destroys that can be made fully atomic are always safe to do concurrently, and as such we now require that actions meet this criteria. See the [update actions guide](/documentation/topics/actions/update-actions.md#fully-atomic-updates) for more.
 
 #### What you'll need to change
 

mix.exs

@@ -65,7 +65,6 @@ defmodule Ash.MixProject do
         "documentation/how_to/validate-changes.md",
         "documentation/how_to/auto-format-code.md",
         "documentation/topics/aggregates.md",
-        "documentation/topics/atomics.md",
         "documentation/topics/attributes.md",
         "documentation/topics/calculations.md",
         "documentation/topics/code-interface.md",
@@ -147,7 +146,6 @@ defmodule Ash.MixProject do
           "documentation/how_to/validate-changes.md",
           "documentation/how_to/auto-format-code.md",
           "documentation/topics/aggregates.md",
-          "documentation/topics/atomics.md",
           "documentation/topics/attributes.md",
           "documentation/topics/calculations.md",
           "documentation/topics/code-interface.md",