feat(nvim): move from avante to codecompanion (#222)

Change the AI tool from [avante][0] to [codecompanion][1] to check if it's a better alternative.

Also, install additional tools such as:

* [mcphub][2]
* [vectorcode][3]

These should improve the experience with AI tooling.

Reviewed-on: #222

[0]: https://github.com/yetone/avante.nvim
[1]: https://codecompanion.olimorris.dev/
[2]: https://github.com/ravitemer/mcphub.nvim
[3]: https://github.com/Davidyz/VectorCode
Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com>
Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>

config/mcphub/config.json

@@ -0,0 +1,21 @@
+{
+	"mcpServers": {
+		"context7": {
+			"command": "pnpm",
+			"args": [
+				"dlx",
+				"@upstash/context7-mcp@latest"
+			]
+		},
+		"git": {
+			"command": "uvx",
+			"args": [
+				"mcp-server-git"
+			]
+		},
+		"vectorcode": {
+			"command": "vectorcode-mcp-server",
+			"args": []
+		}
+	}
+}