docs: align guide categories with remaining content

Monitoring guides were grouped under CI/CD, and several other guides had
categories that did not match their main purpose. Add Observability,
rename Deployment to Services & infrastructure, and move LocalStack and
Django into Testing and Languages & frameworks.

content/guides/django.md

@@ -9,7 +9,7 @@ summary: |
   using a Docker Hardened Image, then add a development stage and Compose Watch
   for fast iteration.
 params:
-  tags: [security]
+  tags: [languages]
   time: 25 minutes
 ---
 

content/guides/go-prometheus-monitoring.md

@@ -11,7 +11,7 @@ aliases:
   - /guides/go-prometheus-monitoring/containerize/
   - /guides/go-prometheus-monitoring/develop/
 params:
-  tags: [cicd]
+  tags: [observability]
   time: 45 minutes
 ---
 

content/guides/localstack.md

@@ -7,7 +7,7 @@ summary: |
   This guide explains how to use Docker to run LocalStack, a local AWS cloud
   stack emulator.
 params:
-  tags: [databases]
+  tags: [testing]
   time: 20 minutes
 ---
 

content/guides/opentelemetry.md

@@ -5,7 +5,7 @@ keywords: OpenTelemetry, observability, tracing
 linktitle: Instrumenting JS Apps with OpenTelemetry
 summary: *desc
 params:
-  tags: [cicd]
+  tags: [observability]
   time: 10 minutes
 ---
 

data/tags.yaml

@@ -11,14 +11,17 @@ databases:
   title: Databases
   description: Run and connect to databases in containers.
 deployment:
-  title: Deployment
-  description: Deploy containerized apps to Kubernetes and other platforms.
+  title: Services & infrastructure
+  description: Run containerized services and set up development infrastructure.
 labs:
   title: Hands-on labs
   description: Interactive, guided labs you can run directly in your browser.
 languages:
   title: Languages & frameworks
   description: Containerize and develop apps in your language of choice.
+observability:
+  title: Observability
+  description: Monitor application metrics and traces with containerized tools.
 security:
   title: Security
   description: Harden images, scan vulnerabilities, and secure your supply chain.

layouts/guides/landing.html

@@ -3,7 +3,7 @@
 {{ end }}
 
 {{ define "main" }}
-  {{- $tagOrder := slice "languages" "ai" "testing" "cicd" "security" "databases" "deployment" "admin" "labs" }}
+  {{- $tagOrder := slice "languages" "ai" "testing" "cicd" "observability" "security" "databases" "deployment" "admin" "labs" }}
 
   <div
     class="not-prose mx-auto flex min-h-[calc(100dvh-7rem)] max-w-7xl flex-col"