Migrate to chezmoi with per-host sway/waybar configs

- Restructure repo into chezmoi source layout (dot_ prefix)
- Add .chezmoi.toml.tmpl mapping hostname to hosttype (laptop/desktop)
- Template sway config.d fragments (outputs/inputs/binds) per host
- Template waybar config.jsonc with shared bar/module definitions
- Host-scope pulsemeeter (flow) and teams-for-linux (desktop hosts) via .chezmoiignore
- Trim install.sh package lists to configured software + config deps
- Remove stale kitty.conf.bak and untracked host fragments

.chezmoitemplates/bar-secondary

@@ -0,0 +1,14 @@
+{
+  "output": "DP-2",
+  "layer": "top",
+  "position": "top",
+  "height": 44,
+  "modules-right": ["clock"],
+  "modules-center": ["sway/workspaces"],
+{{ template "workspaces" (dict "out" "DP-2" "ws" (list "5" "6" "7" "8")) }}
+  "clock": {
+    "timezone": "America/Montreal",
+    "tooltip-format": "<big>{:%Y %B}</big>\n<tt><small>{calendar}</small></tt>",
+    "format": "🕐 {:%H:%M 📅 %d/%m/%y}"
+  }
+}