Add buffer deletion command and update source keymap, configure lsp_lines, null-ls, and trouble plugins

after/plugin/lsp_lines.lua

@@ -0,0 +1,14 @@
+vim.diagnostic.config({
+    virtual_text = false,
+    -- virtual_lines = {
+    --     only_current_line = true
+    -- }
+})
+
+
+-- vim.keymap.set(
+--     "",
+--     "<Leader>ll",
+--     require("lsp_lines").toggle,
+--     { desc = "Toggle lsp_lines" }
+-- )