feat: add SEO descriptions to all pages and fix canonical URL

content/5.nonsense/1.python/1.nvidia-stock-bot.md

@@ -1,6 +1,7 @@
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 navigation: true
 title: Nvidia Stock Bot
+description: A Python bot that monitors GPU stock availability in real time and sends Discord alerts — built during the RTX 5000 series launch shortage.
 main:
   fluid: false
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content/5.nonsense/1.python/2. adguard-cidre.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Adguard CIDRE
+description: A Python script to sync AdGuard Home CIDR allowlists automatically, securing your self-hosted DNS server exposed to the internet.
 main:
   fluid: false
 ---

content/5.nonsense/1.python/3.lumeex.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Lumeex
+description: Lumeex is a static photo gallery site generator built with Python — minimalist, lightweight, and fully customizable without a CMS.
 main:
   fluid: false
 ---

content/5.nonsense/1.python/4.instameex.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Instameex
+description: Instameex is a Docker-based tool to merge SDR and HDR photo exports into a proper gain-map JPEG ready for Instagram HDR upload.
 main:
   fluid: false
 ---