refactor: make site-root an actual file

DocGen4/Output.lean

@@ -89,7 +89,7 @@ def htmlOutput (result : AnalyzerResult) (root : String) : IO Unit := do
   FS.writeFile (basePath / "nav.js") navJs
   FS.writeFile (basePath / "search.js") searchJs
   FS.writeFile (basePath / "mathjax-config.js") mathjaxConfigJs
-  FS.writeFile (basePath / "site-root.js") s!"export const SITE_ROOT = \"{config.root}\";";
+  FS.writeFile (basePath / "site-root.js") (siteRootJs.replace "{siteRoot}" config.root) 
 
   FS.writeFile (basePath / "find" / "index.html") findHtml.toString
   FS.writeFile (basePath / "find" / "find.js") findJs

DocGen4/Output/Base.lean

@@ -47,6 +47,7 @@ def moduleNameToDirectory (basePath : FilePath) (n : Name) : FilePath :=
 
 section Static
   def styleCss : String := include_str "./static/style.css"
+  def siteRootJs : String := include_str "./static/site-root.js"
   def navJs : String := include_str "./static/nav.js"
   def searchJs : String := include_str "./static/search.js"
   def findJs : String := include_str "./static/find/find.js"

static/site-root.js

@@ -0,0 +1 @@
+export const SITE_ROOT = "{siteRoot}";