Replace occurrences of master to main. Fix Edit button

Author: pikinier20

scaladoc/src/dotty/tools/scaladoc/renderers/HtmlRenderer.scala

@@ -223,7 +223,7 @@ class HtmlRenderer(rootPackage: Member, members: Map[DRI, Member])(using ctx: Do
         footer(
           div(id := "generated-by")(
             span(cls := "footer-text")(raw("Generated by")),
-            a(href := "https://github.com/lampepfl/dotty/tree/master/scaladoc")(
+            a(href := "https://github.com/lampepfl/dotty/tree/main/scaladoc")(
               img(
                 src := resolveRoot(link.dri, "images/scaladoc_logo.svg"),
                 alt := "scaladoc",

scaladoc/src/dotty/tools/scaladoc/site/LoadedTemplate.scala

@@ -42,12 +42,12 @@ case class LoadedTemplate(
     val subpages = children.filterNot(_.hidden).map(_.lazyTemplateProperties(ctx))
     def getMap(key: String) = templateFile.settings.getOrElse(key, Map.empty).asInstanceOf[Map[String, Object]]
 
-    val sourceLinks = if !file.exists() then Nil else
+    val sourceLinks = if !templateFile.file.exists() then Nil else
       // TODO (https://github.com/lampepfl/scala3doc/issues/240): configure source root
       // toRealPath is used to turn symlinks into proper paths
-      val actualPath = Paths.get("").toAbsolutePath.relativize(file.toPath.toRealPath())
+      val actualPath = Paths.get("").toAbsolutePath.relativize(templateFile.file.toPath.toRealPath())
       ctx.sourceLinks.pathTo(actualPath).map("viewSource" -> _ ) ++
-        ctx.sourceLinks.pathTo(actualPath, operation = "edit", optionalRevision = Some("master")).map("editSource" -> _)
+        ctx.sourceLinks.pathTo(actualPath, operation = "edit").map("editSource" -> _)
 
     val updatedSettings = templateFile.settings ++ ctx.projectWideProperties +
       ("site" -> (getMap("site") + ("subpages" -> subpages))) + ("urls" -> sourceLinks.toMap) +