Merge 'upstream': various changes 2025-05-10

- fix: rename vim.highlight.on_yank to vim.hl.on_yank
- README: mention fd-find in requirements
- don't lazy-load neo-tree so netrw hijacking on startup works
- Replace vim.opt with vim.o
- feat: switch vim-sleuth for guess-indent.nvim
- Change to Mason's new address

lua/kickstart/plugins/which-key.lua

@@ -18,7 +18,7 @@ return {
     event = 'VimEnter', -- Sets the loading event to 'VimEnter'
     opts = {
       -- delay between pressing a key and opening which-key (milliseconds)
-      -- this setting is independent of vim.opt.timeoutlen
+      -- this setting is independent of vim.o.timeoutlen
       delay = 0,
       icons = {
         -- set icon mappings to true if you have a Nerd Font