Nvim: switch from rls to rust_analyzer

.config/nvim/after/plugin/lspconfig.rc.vim

@@ -53,15 +53,6 @@ vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
   }
 )
 
-nvim_lsp.rls.setup {
-  settings = {
-    rust = {
-      unstable_features = true,
-      build_on_save = false,
-      all_features = true,
-    },
-  },
-}
 nvim_lsp.groovyls.setup {
   cmd = { "java", "-jar", "/home/kmcr/tools/groovy-language-server/build/libs/groovy-language-server-all.jar" },
   on_attach = on_attach,
@@ -84,7 +75,7 @@ nvim_lsp.ccls.setup {
 
 -- Use a loop to conveniently call 'setup' on multiple servers and
 -- map buffer local keybindings when the language server attaches
-local servers = { "pylsp", "cmake" }
+local servers = { "pylsp", "cmake", "rust_analyzer" }
 for _, lsp in ipairs(servers) do
   nvim_lsp[lsp].setup {
     on_attach = on_attach,