style(init): Modularize entire init.lua

Now each plugin is in it's own seperate file that returns the plugin and
it's configs. This makes it simpler for me apply lazy loading to this
config.

Settings, Keymaps, Yank-highlight are inside kickstart directory within
their seperate files.

lua/kickstart/plugins/git-signs.lua

@@ -0,0 +1,74 @@
+return {
+  -- Adds git related signs to the gutter, as well as utilities for managing changes
+  'lewis6991/gitsigns.nvim',
+  opts = {
+    -- See `:help gitsigns.txt`
+    signs = {
+      add = { text = '+' },
+      change = { text = '~' },
+      delete = { text = '_' },
+      topdelete = { text = '‾' },
+      changedelete = { text = '~' },
+    },
+    on_attach = function(bufnr)
+      local gs = package.loaded.gitsigns
+
+      local function map(mode, l, r, opts)
+        opts = opts or {}
+        opts.buffer = bufnr
+        vim.keymap.set(mode, l, r, opts)
+      end
+
+      -- Navigation
+      map({ 'n', 'v' }, ']c', function()
+        if vim.wo.diff then
+          return ']c'
+        end
+        vim.schedule(function()
+          gs.next_hunk()
+        end)
+        return '<Ignore>'
+      end, { expr = true, desc = 'Jump to next hunk' })
+
+      map({ 'n', 'v' }, '[c', function()
+        if vim.wo.diff then
+          return '[c'
+        end
+        vim.schedule(function()
+          gs.prev_hunk()
+        end)
+        return '<Ignore>'
+      end, { expr = true, desc = 'Jump to previous hunk' })
+
+      -- Actions
+      -- visual mode
+      map('v', '<leader>hs', function()
+        gs.stage_hunk { vim.fn.line '.', vim.fn.line 'v' }
+      end, { desc = 'stage git hunk' })
+      map('v', '<leader>hr', function()
+        gs.reset_hunk { vim.fn.line '.', vim.fn.line 'v' }
+      end, { desc = 'reset git hunk' })
+      -- normal mode
+      map('n', '<leader>hs', gs.stage_hunk, { desc = 'git stage hunk' })
+      map('n', '<leader>hr', gs.reset_hunk, { desc = 'git reset hunk' })
+      map('n', '<leader>hS', gs.stage_buffer, { desc = 'git Stage buffer' })
+      map('n', '<leader>hu', gs.undo_stage_hunk, { desc = 'undo stage hunk' })
+      map('n', '<leader>hR', gs.reset_buffer, { desc = 'git Reset buffer' })
+      map('n', '<leader>hp', gs.preview_hunk, { desc = 'preview git hunk' })
+      map('n', '<leader>hb', function()
+        gs.blame_line { full = false }
+      end, { desc = 'git blame line' })
+      map('n', '<leader>hd', gs.diffthis, { desc = 'git diff against index' })
+      map('n', '<leader>hD', function()
+        gs.diffthis '~'
+      end, { desc = 'git diff against last commit' })
+
+      -- Toggles
+      map('n', '<leader>tb', gs.toggle_current_line_blame, { desc = 'toggle git blame line' })
+      map('n', '<leader>td', gs.toggle_deleted, { desc = 'toggle git show deleted' })
+
+      -- Text object
+      map({ 'o', 'x' }, 'ih', ':<C-U>Gitsigns select_hunk<CR>', { desc = 'select git hunk' })
+    end,
+  },
+}