use nvim-cmp for cmd line completion

- remove wilder.nvim and its config
- add blink.cmp config as backup solution

lua/config/nvim-cmp.lua

@@ -7,6 +7,7 @@ require("cmp_path")
 require("cmp_buffer")
 require("cmp_omni")
 require("cmp_nvim_ultisnips")
+require("cmp_cmdline")
 
 local MiniIcons = require("mini.icons")
 
@@ -71,6 +72,23 @@ cmp.setup.filetype("tex", {
   },
 })
 
+cmp.setup.cmdline("/", {
+  mapping = cmp.mapping.preset.cmdline(),
+  sources = {
+    { name = "buffer" },
+  },
+})
+
+cmp.setup.cmdline(":", {
+  mapping = cmp.mapping.preset.cmdline(),
+  sources = cmp.config.sources({
+    { name = "path" },
+  }, {
+    { name = "cmdline" },
+  }),
+  matching = { disallow_symbol_nonprefix_matching = false },
+})
+
 --  see https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance#how-to-add-visual-studio-code-dark-theme-colors-to-the-menu
 vim.cmd([[
   highlight! link CmpItemMenu Comment