Fix docs sidebar navigation and streamline Hextra site

docs/content/_index.md

@@ -1,6 +1,12 @@
 ---
 title: 'certel'
 toc: false
+# Give every descendant page the docs layout so the left navigation sidebar
+# persists on single pages too (metrics, alternatives, and each ADR). Without
+# this they fall back to Hextra's centered no-sidebar single layout. The
+# cascade does not apply to this home page itself, so the landing cards stay.
+cascade:
+  type: docs
 ---
 
 **Cert**ificate **E**xpiry & **L**ogs.

docs/content/adr/adr-0000-template.md

@@ -1,7 +1,13 @@
 ---
 title: 'NNNN. Short title of the decision'
 weight: 999
+# This is the copy-me scaffold, not a real decision: keep it reachable via the
+# explicit link in the ADR index Conventions section, but out of the auto-built
+# navigation sidebar, the site search, and the generated llms.txt outline.
 excludeSearch: true
+llms: false
+sidebar:
+  exclude: true
 ---
 
 - **Status:** Proposed | Accepted | Superseded by NNNN | Deprecated

docs/content/alternatives.md

@@ -1,7 +1,7 @@
 ---
 title: 'Survey of existing SSL certificate monitoring tools'
 linkTitle: 'Alternatives'
-weight: 20
+weight: 40
 ---
 
 An analysis of open-source alternatives carried out before development started

docs/hugo.toml

@@ -6,6 +6,13 @@ title = "certel"
 enableRobotsTXT = true
 enableGitInfo = true
 
+# Emit an llms.txt at the site root — a structured outline of every section and
+# page for AI agents/LLMs. Only the home kind carries the extra format; page and
+# section keep Hugo's defaults. Exclude a page with `llms: false` in its front
+# matter. The template pulls the site description below into the summary line.
+[outputs]
+  home = ["html", "llms"]
+
 [module]
   [[module.imports]]
     path = "github.com/imfing/hextra"
@@ -24,13 +31,9 @@ enableGitInfo = true
 
 [menu]
   [[menu.main]]
-    name = "Documentation"
+    name = "Home"
     pageRef = "/"
     weight = 1
-  [[menu.main]]
-    name = "ADRs"
-    pageRef = "/adr"
-    weight = 2
   [[menu.main]]
     name = "Search"
     weight = 3
@@ -44,6 +47,8 @@ enableGitInfo = true
       icon = "github"
 
 [params]
+  description = "Self-hosted SSL/TLS certificate monitor: a single binary and a single YAML file, with templated webhook alerts and optional Prometheus metrics."
+
   [params.navbar]
     displayTitle = true
     displayLogo = false

docs/i18n/en.yaml

@@ -0,0 +1 @@
+copyright: "© 2026 [certel](https://github.com/antonkomarev/certel)"