docs: Add descriptions to recording pages using text from index

aider/website/docs/recordings/auto-accept-architect.md

@@ -2,6 +2,7 @@
 parent: Screen recordings
 nav_order: 1
 layout: minimal
+description: See how a new command-line option is added to automatically accept edits proposed by the architect model, with implementation. Aider also updates the project's HISTORY file.
 ---
 
 # Add --auto-accept-architect feature

aider/website/docs/recordings/dont-drop-original-read-files.md

@@ -2,6 +2,7 @@
 parent: Screen recordings
 nav_order: 1
 layout: minimal
+description: Follow along as aider is modified to preserve read-only files specified at launch when using the /drop command. Aider does this implementation and adds test coverage.
 ---
 
 # Don't /drop read-only files added at launch

aider/website/docs/recordings/model-accepts-settings.md

@@ -2,7 +2,7 @@
 parent: Screen recordings
 nav_order: 1
 layout: minimal
-description: 
+description: Watch the implementation of a warning system that alerts users when they try to apply reasoning settings to models that don't support them. Includes adding model metadata, confirmation dialogs, refactoring, and comprehensive test coverage.
 ---
 
 # Warn when users apply unsupported reasoning settings

aider/website/docs/recordings/tree-sitter-language-pack.md

@@ -2,6 +2,7 @@
 parent: Screen recordings
 nav_order: 0
 layout: minimal
+description: Watch how aider adds support for tons of new programming languages by integrating with tree-sitter-language-pack. Demonstrates using aider to script downloading a collection of files, and using ad-hoc bash scripts to have aider modify a collection of files.
 ---
 
 # Add language support via tree-sitter-language-pack