chore: bump toolchain to lean v4.26.0-rc2 and update to latest verso (#198)

Author: jcreedcmu

book/Main.lean

@@ -15,7 +15,7 @@ def config : Config where
   emitHtmlMulti := true
   htmlDepth := 1
   extraFiles := [("static", "static")]
-  extraCss := [
+  extraCss := Std.HashSet.ofList [
     "/static/theme.css",
     "/static/fonts/source-serif/source-serif-text.css",
     "/static/fonts/source-code-pro/source-code-pro.css",

book/TPiL/Examples.lean

@@ -746,8 +746,8 @@ block_extension Block.goals (goals : Array (Highlighted.Goal Highlighted))
             {{← if goals.isEmpty then
                 pure {{"All goals completed! 🐙"}}
               else
-                withCollapsedSubgoals .never <|
-                  .seq <$> goals.mapIndexedM (fun ⟨i, _⟩ x => x.toHtml (g := Verso.Genre.Manual) (·.toHtml) i)}}
+                withCollapsedSubgoals (g := Verso.Genre.Manual) .never <|
+                  .seq <$> (goals.mapIdxM (fun i x => x.toHtml (·.toHtml) i))}}
           </span>
         </div>
       }}

book/lake-manifest.json

@@ -5,17 +5,27 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "b1cdd66be1f055926796aa804fdc13c9e9ac17c6",
+   "rev": "bc7bf09465ec53856c2b0fcc3f847af342254238",
    "name": "verso",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
    "inherited": false,
    "configFile": "lakefile.lean"},
+  {"url": "https://github.com/leanprover-community/plausible",
+   "type": "git",
+   "subDir": null,
+   "scope": "",
+   "rev": "ec4a54b5308c1f46b4b52a9c62fb67d193aa0972",
+   "name": "plausible",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": "main",
+   "inherited": true,
+   "configFile": "lakefile.toml"},
   {"url": "https://github.com/acmepjz/md4lean",
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "66aefec2852d3e229517694e642659f316576591",
+   "rev": "38ac5945d744903ffcc473ce1030223991b11cf6",
    "name": "MD4Lean",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -25,7 +35,7 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "57f4e6c99a4132d54a2105dec21c2e3c2af98b15",
+   "rev": "08f238aa4e015b7609648369ae64cde26286d115",
    "name": "subverso",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",

book/lean-toolchain

@@ -1 +1 @@
-leanprover/lean4:v4.25.0-rc2
+leanprover/lean4:v4.26.0-rc2