Docs structure fixes (#49)

Author: Tiendil

README.md

@@ -159,7 +159,6 @@ Use `donna --help` for a quick reference.
 
 You find detailed documentation in the agent instructions — they are readable and always accurate:
 
-- [Intro](./donna/artifacts/intro.md) — introduction to Donna tool.
 - [CLI specification](./donna/artifacts/usage/cli.md) — full list of commands and how to use them.
 - [Artifacts](./donna/artifacts/usage/artifacts.md) — what are Donna artifact and how to use them.
 - [Worlds](./donna/artifacts/usage/worlds.md) — how Donna discovers and manages its artifacts.
@@ -290,7 +289,7 @@ To execute a workflow, Donna uses a simplified virtual machine (VM) that maintai
 
 ### Operations
 
-You can find detailed docs on built-in operations in the [artifacts documentation](./donna/artifacts/usage/operations.md).
+You can find detailed docs on built-in operations in the [artifacts documentation](./donna/artifacts/usage/artifacts.md).
 
 Here is a short list of them:
 

donna/artifacts/usage/artifacts.md

@@ -170,7 +170,9 @@ kind = "donna.lib.request_action"
 
 #### Kinds of Workflow Operations
 
-1. `donna.lib.request_action` operation kind indicates that Donna will request the agent to perform some action.
+##### `donna.lib.request_action`
+
+`donna.lib.request_action` operation kind indicates that Donna will request the agent to perform some action.
 
 The content of the tail section is the text instructions for the agent on what to do.
 
@@ -188,7 +190,9 @@ Here may be any additional instructions, requirements, notes, references, etc.
 
 **The body of the operation MUST contain a neat strictly defined algorithm for the agent to follow.**
 
-2. `donna.lib.run_script` operation kind executes a script from the operation body without agent/user interaction.
+##### `donna.lib.run_script`
+
+`donna.lib.run_script` operation kind executes a script from the operation body without agent/user interaction.
 
 The body of the operation MUST include exactly one fenced code block whose info string includes `<language> donna script`.
 Any other text in the operation body is ignored.
@@ -229,7 +233,9 @@ Routing rules:
 When `save_stdout_to` and/or `save_stderr_to` are set, the operation stores captured output in the task context
 under the specified variable names.
 
-3. `donna.lib.output` operation kind emits its body as an output cell and then continues to the configured next step.
+##### `donna.lib.output`
+
+`donna.lib.output` operation kind emits its body as an output cell and then continues to the configured next step.
 
 The body of the operation is rendered as an output cell during execution.
 
@@ -241,7 +247,9 @@ kind = "donna.lib.output"
 next_operation_id = "<next_operation_id>"  # required
 ```
 
-4. `donna.lib.finish` operation kind indicates that the workflow is finished.
+##### `donna.lib.finish`
+
+`donna.lib.finish` operation kind indicates that the workflow is finished.
 
 The body of the operation is rendered as an output cell before the workflow completes.