Switched to using pcall for imports

Signed-off-by: Taken <taken@mairimashita.org>

after/plugin/treesitter.lua

@@ -1,5 +1,10 @@
-require'nvim-treesitter.configs'.setup {
-  ensure_installed = { "lua", "vim", "vimdoc", "javascript", "java" },
+local status, treesitter = pcall(require, "nvim-treesitter.configs")
+if not status then
+    return
+end
+
+treesitter.setup {
+  ensure_installed = { "lua", "vim", "vimdoc", "javascript", "java", "json" },
   sync_install = false,
   auto_install = true,