diff --git a/app/signup/migrations/0001_initial.py b/app/signup/migrations/0001_initial.py
index ab412e6..e190ce2 100644
--- a/app/signup/migrations/0001_initial.py
+++ b/app/signup/migrations/0001_initial.py
@@ -1,4 +1,3 @@
-# flake8: noqa
 # Generated by Django 5.0.1 on 2024-01-12 10:04
 
 from django.db import migrations, models
@@ -15,7 +14,8 @@ class Migration(migrations.Migration):
         migrations.CreateModel(
             name='Signup',
             fields=[
-                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('id', models.BigAutoField(auto_created=True,
+                 primary_key=True, serialize=False, verbose_name='ID')),
                 ('email', models.EmailField(max_length=254)),
                 ('created_at', models.DateTimeField(auto_now_add=True)),
                 ('anonymized_ip', models.GenericIPAddressField()),
@@ -25,6 +25,7 @@ class Migration(migrations.Migration):
         ),
         migrations.AddConstraint(
             model_name='signup',
-            constraint=models.UniqueConstraint(fields=('email',), name='unique_email'),
+            constraint=models.UniqueConstraint(
+                fields=('email',), name='unique_email'),
         ),
     ]
diff --git a/blog/themes/default/README.md b/blog/themes/default/README.md
deleted file mode 100644
index 3b6ddfb..0000000
--- a/blog/themes/default/README.md
+++ /dev/null
@@ -1,25 +0,0 @@
-# Simple Style Hugo Theme
-
-My simple style hugo theme, based on [this webpage template](https://yanlinlin82.github.io/webpage-templates/simple-style/index.html)
-
-Online demo of this theme: [simple-style-demo](https://yanlinlin82.github.io/simple-style-demo/)
-
-## Supported Parameters
-
-In `config.toml`
-
-```
-[params]
-subtitle = "Sub title of the site"
-favicon = "/<path-to-site-icon>/logo.ico"
-githubUrl = "https://github.com/<your-name>/<site-proj-name>/"
-referrer = "always"
-author = "..."
-description = "..."
-keywords = "..."
-googleSiteVerification = "<google-site-verification-code>"
-search = "..."  # baidu, google, bing, duckduckgo
-dateFormat = "Mon Jan 2 15:04:05 MST 2006"  # see: https://gohugo.io/functions/format/#gos-layout-string
-externalLinkIcon = true
-externalLinkNewWindow = true
-```
diff --git a/flake.nix b/flake.nix
index b1c470c..ce307e0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -68,6 +68,7 @@
               entry = "${pkgs.python3Packages.autopep8}/bin/autopep8 -i";
               files = "\\.py$";
             };
+            markdownlint.enable = true;
             unit-tests = {
               enable = false;
               # ?? this is a directory, how do I run the script?