chore(repo): move docs media to LFS and stop tracking downloaded build tools (#434)

- Track docs/images/** and docs/videos/** with Git LFS
- Add packages/browseros/build/tools/ to .gitignore
- Remove appimagetool-x86_64.AppImage from version control (downloaded on demand by build script)

.gitattributes

@@ -3,7 +3,6 @@ resources/nxtscape-productivity.gif filter=lfs diff=lfs merge=lfs -text
 resources/media/nxtscape-agent.gif filter=lfs diff=lfs merge=lfs -text
 resources/media/nxtscape-chat.gif filter=lfs diff=lfs merge=lfs -text
 docs/videos/browserOS-agent-in-action.gif filter=lfs diff=lfs merge=lfs -text
-
 # Mark Python build/tooling files as generated so they don't count in language stats
 packages/browseros/build/**/*.py linguist-generated
 packages/browseros/chromium_patches/**/*.py linguist-generated

.gitignore

@@ -24,3 +24,5 @@ gclient.json
 .env
 .grove/
 **/resources/binaries/
+
+packages/browseros/build/tools/