switch from terraform extension to opentofu extension

coding_guidelines/README.md

@@ -64,7 +64,6 @@ set tabstop=2                              " Make tabs as wide as two spaces
 #### Recommended extensions
 
 * `davidanson.vscode-markdownlint`
-* `mauve.terraform`
 * `ms-azuretools.vscode-docker`
 * `ms-kubernetes-tools.vscode-kubernetes-tools`
 * `ms-vscode-remote.remote-wsl` (when using WSL)
@@ -73,7 +72,7 @@ set tabstop=2                              " Make tabs as wide as two spaces
 * `yzhang.markdown-all-in-one`
 * `signageos.signageos-vscode-sops`
 * `skyscrapers-engineering.vscode-kms`
-* `hashicorp.terraform`
+* `gamunu.opentofu`
 
 ### Atom