ci: set gh-pages workflow to run on ubuntu-latest (#520)

Author: tjex

.github/workflows/build-docs.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   pages:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4

.github/workflows/gh-pages.yml

@@ -13,7 +13,7 @@ concurrency:
 
 jobs:
   pages:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}

docs/conf.py

@@ -30,3 +30,4 @@
 html_title = "zk : a plain text note-taking assistant"
 # html_static_path = ["_static"]
 # templates_path = ["_templates"]
+