Fix starting incorrect ruby_lsp

To fix lsp client failing;

- Disable Mason's auto install for ruby_lsp.
- Explicit enable for ruby_lsp.
- Specify the command to start the lsp client.

Shopify/ruby-lsp#2347

nvim/lua/plugins/lspconfig.lua

@@ -6,6 +6,13 @@ return {
         underline = false,
         virtual_text = false,
       },
+      servers = {
+        ruby_lsp = {
+          mason = false,
+          enabled = true,
+          cmd = { "/Users/ogirginc/.asdf/shims/ruby-lsp" },
+        },
+      },
     },
   },
 }