Bump Vim version docs to 8.1+ and lead onboarding with ,? (#78)

Two small first-run UX fixes bundled together (both touch install.sh
and README, with the same review surface):

1. README badge and install.sh warn line bumped 8.0+ → 8.1+. The
   runtime conditionally relies on patches 8.1.0360 (diffopt) and
   8.1.1517 (completeopt+=popup). Guards no-op on 8.0 but the docs
   were silently misleading anyone debugging on stale Vim.

2. "First steps inside Vim" block reordered so ,? leads. The cheat
   sheet is the most useful onboarding asset; it shouldn't be buried
   below three "how to leave" hints. Also promoted ,x above :q!
   since the latter is emergency, not first-run.

Closes #76
Closes #77

CHANGELOG.md

@@ -23,6 +23,9 @@
 
 ### Fixed
 
+- README badge and `install.sh` recommend Vim 8.1+ instead of 8.0+ —
+  the runtime conditionally relies on patches `8.1.0360` (diffopt) and
+  `8.1.1517` (completeopt+=popup), so 8.0 users hit option errors
 - `install.sh` no longer silently `PlugClean!`s user-added plugins from
   `~/.vim/plugged`; it now lists undeclared plugin directories first and
   asks before removing them (`--yes` skips the removal entirely)
@@ -40,6 +43,9 @@
 
 ### Changed
 
+- `install.sh` "First steps inside Vim" block now leads with `,?`
+  (cheat sheet) — the single best onboarding asset is now the first
+  thing a new user sees after install, not the fourth
 - `set exrc`/`set secure` are now opt-in via `g:chopsticks_enable_exrc = 1`;
   Vim no longer sources project-local `.vimrc`/`.exrc` from the working
   directory by default

README.md

@@ -10,7 +10,7 @@
 
 <p align="center">
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" alt="MIT License"></a>
-  <a href="https://www.vim.org/"><img src="https://img.shields.io/badge/Vim-8.0%2B-brightgreen?style=flat-square" alt="Vim 8.0+"></a>
+  <a href="https://www.vim.org/"><img src="https://img.shields.io/badge/Vim-8.1%2B-brightgreen?style=flat-square" alt="Vim 8.1+"></a>
   <a href="#install"><img src="https://img.shields.io/badge/platform-macOS%20%7C%20Linux-lightgrey?style=flat-square" alt="Platform"></a>
   <a href="https://github.com/m1ngsama/chopsticks/actions"><img src="https://img.shields.io/github/actions/workflow/status/m1ngsama/chopsticks/test.yml?style=flat-square&label=tests" alt="Tests"></a>
   <a href="https://github.com/m1ngsama/chopsticks/releases"><img src="https://img.shields.io/github/v/release/m1ngsama/chopsticks?style=flat-square&color=orange" alt="Release"></a>

install.sh

@@ -519,7 +519,7 @@ fi
 [[ -n "$VIM_BIN" ]] || die "vim installed but not found in PATH"
 ok "Found: $("$VIM_BIN" --version | head -n1) ($VIM_BIN)"
 "$VIM_BIN" --version | grep -q 'Vi IMproved 8\|Vi IMproved 9' || \
-    warn "Vim 8.0+ recommended for full async/LSP support — some features may not work"
+    warn "Vim 8.1+ recommended for full async/LSP support — some features may not work"
 
 # Node.js (optional — vim-lsp needs no Node.js; only npm formatters do)
 HAS_NODE=0; command -v node >/dev/null 2>&1 && HAS_NODE=1
@@ -1201,10 +1201,10 @@ echo -e "  ${CYAN}vim .${NC}          Open dashboard in current directory"
 echo -e "  ${CYAN}vim myfile${NC}     Edit a specific file"
 echo ""
 echo -e "${BOLD}  First steps inside Vim${NC}"
+echo -e "  ${CYAN},?${NC}            Open cheat sheet — your map of every keybinding"
 echo -e "  ${CYAN}Esc${NC}          Exit insert mode → back to Normal"
-echo -e "  ${CYAN}:q!${NC} + Enter   Emergency quit without saving"
 echo -e "  ${CYAN},x${NC}            Save and quit"
-echo -e "  ${CYAN},?${NC}            Open cheat sheet"
+echo -e "  ${CYAN}:q!${NC} + Enter   Emergency quit without saving"
 if [[ $CONFIG_PROFILE != "minimal" ]]; then
     echo -e "  ${CYAN}:LspInstallServer${NC}  Install LSP for current filetype"
 fi