feat(neovim): experiment with ai agents (#237)

The following changes are introduced:

* Update `kickstart.nvim` to latest commit ([6ba24..3338d](6ba2408cdf..3338d39206))
* Add [`goose`](https://block.github.io/goose/) and [`goose.nvim`](https://block.github.io/goose/)
* Re-enable [`avante.nvim`](https://block.github.io/goose/)

Reviewed-on: #237
Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com>
Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>

config/aider/config.yml

@@ -1,10 +1,13 @@
 ---
-model: gemini/gemini-2.5-pro-preview-03-25
+reasoning-effort: medium
+thinking-tokens: 8k
+model: gemini/gemini-2.5-pro-preview-05-06
 weak-model: gemini/gemini-2.0-flash-001
-editor-model: gemini/gemini-2.5-pro-preview-03-25
+editor-model: gemini/gemini-2.5-pro-preview-05-06
 editor: nvim
 git: true
 gitignore: true
 auto-commits: false
 read:
   - CONVENTIONS.md
+  - CLAUDE.md