feat(nvim): new nvim config (#28)

* feat(nvim): clean config, work in progress
* feat: refactored plugins and configs
* feat: stylua config, ufo, lsp refactor, cleanup
* feat: renamed nvim to nvim-lazy, added alias
* feat: renamed nvim-clean to be nvim, updated alias

config/nvim/lua/plugins/cmp.lua

@@ -0,0 +1,60 @@
+return {
+  -- Autocompletion
+  -- https://github.com/hrsh7th/nvim-cmp
+  {
+    'hrsh7th/nvim-cmp',
+    event = 'InsertEnter',
+    dependencies = {
+      'hrsh7th/cmp-nvim-lsp',
+      'L3MON4D3/LuaSnip',
+      'saadparwaiz1/cmp_luasnip',
+    },
+    config = function()
+      -- nvim-cmp setup
+      local cmp = require 'cmp'
+      local luasnip = require 'luasnip'
+
+      cmp.setup {
+        view = {
+          entries = 'native',
+        },
+        snippet = {
+          expand = function(args)
+            luasnip.lsp_expand(args.body)
+          end,
+        },
+        mapping = cmp.mapping.preset.insert {
+          ['<C-d>'] = cmp.mapping.scroll_docs(-4),
+          ['<C-f>'] = cmp.mapping.scroll_docs(4),
+          ['<C-Space>'] = cmp.mapping.complete(),
+          ['<CR>'] = cmp.mapping.confirm {
+            behavior = cmp.ConfirmBehavior.Replace,
+            select = true,
+          },
+          ['<Tab>'] = cmp.mapping(function(fallback)
+            if cmp.visible() then
+              cmp.select_next_item()
+            elseif luasnip.expand_or_jumpable() then
+              luasnip.expand_or_jump()
+            else
+              fallback()
+            end
+          end, { 'i', 's' }),
+          ['<S-Tab>'] = cmp.mapping(function(fallback)
+            if cmp.visible() then
+              cmp.select_prev_item()
+            elseif luasnip.jumpable(-1) then
+              luasnip.jump(-1)
+            else
+              fallback()
+            end
+          end, { 'i', 's' }),
+        },
+        sources = {
+          { name = 'nvim_lsp' },
+          { name = 'luasnip' },
+        },
+      }
+    end,
+  },
+}