refactor(wisdom): rename wisdomSimpleSlice to wisdomSlice

Rename the helper function `wisdomSimpleSlice` to `wisdomSlice` across
the codebase and update documentation to reflect the new naming
convention. This change simplifies the API for creating trivial
single-package slices.

modules/wisdom/browsers/chrome.nix

@@ -1,5 +1,5 @@
 { self, ... }: {
-  flake.homeManagerModules.wisdomBrowsersChrome = self.lib.wisdomSimpleSlice {
+  flake.homeManagerModules.wisdomBrowsersChrome = self.lib.wisdomSlice {
     path = "browsers.chrome";
     default = false;
     description = "Chrome (unfree, needs `allowUnfree`); skipped if nixpkgs has no build for this platform.";

modules/wisdom/browsers/edge.nix

@@ -1,5 +1,5 @@
 { self, ... }: {
-  flake.homeManagerModules.wisdomBrowsersEdge = self.lib.wisdomSimpleSlice {
+  flake.homeManagerModules.wisdomBrowsersEdge = self.lib.wisdomSlice {
     path = "browsers.edge";
     default = false;
     description = "Edge (unfree); skipped if unavailable on this platform.";

modules/wisdom/browsers/flow.nix

@@ -1,5 +1,5 @@
 { self, ... }: {
-  flake.homeManagerModules.wisdomBrowsersFlow = self.lib.wisdomSimpleSlice {
+  flake.homeManagerModules.wisdomBrowsersFlow = self.lib.wisdomSlice {
     path = "browsers.flow";
     default = false;
     description = "[Flow](https://github.com/MultiboxLabs/flow-browser) — upstream AppImage wrapped for NixOS.";