don't fail keymaps if plugins aren't installed

lua/user/keymaps.lua

@@ -129,9 +129,19 @@ keymap("i", "<M-k>", "<C-o>gk", opts)
 -- vim.keymap.set('n', '<Leader>hb', function() gs.blame_line{full=false} end, opts)
 -- vim.keymap.set('n', '<Leader>hB', function() gs.blame_line{full=true} end, opts)
 
-local wk = require("which-key")
-local gs = require("gitsigns")
-wk.register({
+local function otherkeymaps()
+    local ok
+    local wk
+    local gs
+    ok, wk = pcall(require, "which-key")
+    if not ok then
+        return
+    end
+    ok, gs = pcall(require, "gitsigns")
+    if not ok then
+        return
+    end
+    wk.register({
       g = {
         name = "gitsigns",
         p = { "<cmd>Gitsigns preview_hunk<cr>", "Preview hunk" },
@@ -139,5 +149,7 @@ wk.register({
         B = { function() gs.blame_line{full=true} end, "Blame line (full)" }
       },
       prefix = "<leader>"
-})
+    })
+end
 
+otherkeymaps()