diff --git a/_config.yaml b/_config.yaml
index 6718c3b..ca99a2c 100644
--- a/_config.yaml
+++ b/_config.yaml
@@ -44,6 +44,11 @@ license:
 # timezone
 tz: America/New York
 
+# 
+jekyll_theme_isabelline:
+  name: Jekyll theme «Isabelline»
+  url: https://github.com/rzen/jekyll-theme-isabelline
+
 # used for edit link in the footer
 # leave blank to disable edit link
 # TODO: optional
@@ -67,7 +72,7 @@ collections:
     permalink: /link/:title/
     output: true
   posts:
-    permalink: /post/:title/
+    # permalink: /post/:title/
     output: true
   pages:
     permalink: /:title/
@@ -106,7 +111,7 @@ tag_page_dir: tags
 # a superset flavor of Markdown
 # https://kramdown.gettalong.org
 kramdown:
-  auto_ids: false
+  auto_ids: true
   syntax_highlighter_opts:
     block:
       default_lang: javascript
@@ -127,4 +132,4 @@ sass:
 # include: ["_pages", "_blog", ]
 
 # dont move the following to _site/
-exclude: ["docker-compose.yaml", "Gemfile.lock", "Gemfile"]
\ No newline at end of file
+exclude: ["docker-compose.yaml", "Gemfile.lock", "Gemfile", "*.gem"]
\ No newline at end of file