doc/SUMMARY: replace with the other unicode gear

Author: astro

doc/src/SUMMARY.md

@@ -7,13 +7,13 @@
   - [Shared directories](./shares.md)
   - [CPU emulation](./cpu-emulation.md)
   - [Output options](./output-options.md)
-  - [MicroVM options reference 󰒓](./microvm-options.md)
+  - [MicroVM options reference ⚙️](./microvm-options.md)
 - [Running a MicroVM as a package](./packages.md)
 - [Preparing a host for declarative MicroVMs](./host.md)
   - [A simple network setup](./simple-network.md)
   - [Advanced network setup](./advanced-network.md)
   - [Host systemd services](./host-systemd.md)
-  - [Host options reference 󰣖](./host-options.md)
+  - [Host options reference ⚙️](./host-options.md)
 - [Declarative MicroVMs](./declarative.md)
 - [Imperative MicroVM management](./microvm-command.md)
   - [Deploy via SSH](./ssh-deploy.md)