chore: remove deprecation notifications

These methods are still deprecated, but will remain until a substitute
is implemented and available.

lua/nvim-lsp-installer.lua

@@ -262,9 +262,9 @@ end
 ---@deprecated Setup servers directly via lspconfig instead. See https://github.com/williamboman/nvim-lsp-installer/discussions/636
 ---@param cb fun(server: Server) @Callback to be executed whenever a server is ready to be set up.
 function M.on_server_ready(cb)
-    notify(
-        ".on_server_ready() has been deprecated. Set up servers directly via lspconfig instead. See https://github.com/williamboman/nvim-lsp-installer/discussions/636",
-        vim.log.levels.WARN
+    assert(
+        not settings.uses_new_setup,
+        "Please set up servers directly via lspconfig instead of using .on_server_ready() (this method is now deprecated)! Refer to :h nvim-lsp-installer-quickstart for more information."
     )
     dispatcher.register_server_ready_callback(cb)
     vim.schedule(function()

lua/nvim-lsp-installer/server.lua

@@ -77,10 +77,6 @@ function M.Server:setup(opts)
         not settings.uses_new_setup,
         "Please set up servers directly via lspconfig instead of going through nvim-lsp-installer (this method is now deprecated)! Refer to :h nvim-lsp-installer-quickstart for more information."
     )
-    notify(
-        "server:setup() has been deprecated. Set up servers directly via lspconfig instead. See https://github.com/williamboman/nvim-lsp-installer/discussions/636",
-        vim.log.levels.WARN
-    )
     self:setup_lsp(opts)
     if not (opts.autostart == false) then
         self:attach_buffers()