fix: lychee root dir errors (#6656)

Author: LesnyRumcajs

.config/lychee.toml

@@ -4,7 +4,9 @@
 
 verbose = "debug"
 no_progress = true
-exclude_path = ["./node_modules", "./docs/node_modules", "./documentation", "./target"]
+# Base URL for resolving root-relative links in docs (e.g., /img/logo.png -> https://docs.forest.chainsafe.io/img/logo.png)
+base_url = "https://docs.forest.chainsafe.io"
+exclude_path = ["./node_modules", "./docs/node_modules", "./target", "./docs/build", "./build"]
 exclude = [
   # Avoid Github rate limits
   "github.com/ChainSafe/forest",