docs: Fix missing and broken imports in homepage solver example (#648)

docs/index.qmd

@@ -184,12 +184,12 @@ from inspect_ai import Task, task
 from inspect_ai.dataset import example_dataset
 from inspect_ai.scorer import model_graded_fact
 from inspect_ai.solver import (               
-  chain, prompt_template, generate, self_critique   
-) 
+  solver, chain, prompt_template, generate, self_critique
+)
 
 DEFAULT_PROMPT="<prompt>"
 
-from tree_of_thought imoprt TREE_PROMPT, generate_tree
+from tree_of_thought import TREE_PROMPT, generate_tree
 
 @solver 
 def critique():
@@ -280,4 +280,4 @@ These sections discuss more advanced features and workflow. You don't need to re
 
 -   [Eval Logs](#sec-eval-logs) explores how to get the most out of evaluation logs for developing, debugging, and analyzing evaluations.
 
--   [Extensions](#sec-extensions) describes the various ways you can extend Inspect, including adding support for new Model APIs, tool execution environments, and storage platforms (for datasets, prompts, and logs).
+-   [Extensions](#sec-extensions) describes the various ways you can extend Inspect, including adding support for new Model APIs, tool execution environments, and storage platforms (for datasets, prompts, and logs).