chore: migrate to tsuki theme

- Replace hugo-theme-stack submodule with tsuki
- config/_default/hugo.yml: theme: tsuki
- config/_default/permalinks.yml: keep /p/:slug/ for posts to preserve
  existing URLs (matches Stack default)
- config/_default/markup.yml: add parser.autoHeadingIDType: github-ascii
  for ASCII heading slugs
- config/_default/params.yml: add tsuki-required keys (search.enable,
  home.recentPostsCount); restructure comments.giscus to tsuki schema
  (repoId/categoryId lowercase, theme, lang, etc.). Stack-only params
  kept for now in case of rollback (silently ignored by tsuki).
- Move content/page/archives -> content/archives (tsuki uses kind=section)
- Move content/page/search -> content/search (drop json output;
  Pagefind index built in CI replaces Fuse.js search)
- Add data/profile.yaml driving the homepage hero
- Copy assets/img/avatar.png -> static/img/ for tsuki's relURL resolution

Verified: 717 pages build clean, 280 aliases preserve old URLs.
Posts at /p/<slug>/, comments + TOC + archives + search all render.

.gitmodules

@@ -1,3 +1,3 @@
-[submodule "themes/hugo-theme-stack"]
-	path = themes/hugo-theme-stack
-	url = https://github.com/CaiJimmy/hugo-theme-stack/
+[submodule "themes/tsuki"]
+	path = themes/tsuki
+	url = https://github.com/tiennm99/tsuki.git

config/_default/hugo.yml

@@ -1,6 +1,6 @@
 baseurl: https://miti99.com/
 languageCode: vi
-theme: hugo-theme-stack
+theme: tsuki
 title: miti99
 defaultContentLanguage: vi
 hasCJKLanguage: false

config/_default/markup.yml

@@ -13,6 +13,8 @@ goldmark:
             - \)
   renderer:
     unsafe: true
+  parser:
+    autoHeadingIDType: github-ascii
 
 tableOfContents:
   endLevel: 4

config/_default/params.yml

@@ -4,6 +4,18 @@ featuredImageField: image
 rssFullContent: true
 favicon: /favicon.png
 
+# tsuki theme options
+search:
+  enable: true
+
+home:
+  recentPostsCount: 5
+
+# Stack params below are ignored by tsuki but kept for now in case of rollback.
+# To clean up: remove sidebar, widgets, article.toc/readingTime/license,
+# comments.{disqusjs,utterances,beaudar,remark42,vssue,waline,twikoo,cactus,gitalk,cusdis},
+# imageProcessing, colorScheme, defaultImage, opengraph.twitter
+
 footer:
   since: 2020
   customText: "Made by miti99 with ❤️"
@@ -88,14 +100,22 @@ comments:
     siteName: ""
 
   giscus:
+    enable: true
     repo: tiennm99/miti99
-    repoID: R_kgDOILzXrw
+    repoId: R_kgDOILzXrw
     category: Announcements
-    categoryID: DIC_kwDOILzXr84CeYAw
+    categoryId: DIC_kwDOILzXr84CeYAw
     mapping: pathname
+    strict: "0"
+    reactionsEnabled: "1"
+    inputPosition: bottom
+    theme: preferred_color_scheme
+    lang: vi
+    # Legacy Stack keys kept for reference; ignored by tsuki:
+    repoID: R_kgDOILzXrw
+    categoryID: DIC_kwDOILzXr84CeYAw
     lightTheme: light
     darkTheme: dark
-    reactionsEnabled: 1
     emitMetadata: 0
 
   gitalk:

config/_default/permalinks.yml

@@ -1,2 +1,2 @@
-# post: /p/:slug/
+post: /p/:slug/
 page: /:slug/

content/archives/_index.md

@@ -0,0 +1,9 @@
+---
+title: "Archives"
+description: "Toàn bộ bài viết theo năm và tháng."
+menu:
+  main:
+    weight: -70
+    params:
+      icon: archives
+---

content/page/archives/index.md

@@ -1,10 +0,0 @@
----
-title: Archives
-layout: archives
-slug: archives
-menu:
-  main:
-    weight: -70
-    params:
-      icon: archives
----

content/page/search/index.md

@@ -1,13 +0,0 @@
----
-title: "Search"
-slug: "search"
-layout: "search"
-outputs:
-    - html
-    - json
-menu:
-    main:
-        weight: -60
-        params: 
-            icon: search
----

content/search/_index.md

@@ -0,0 +1,9 @@
+---
+title: "Search"
+description: "Tìm kiếm bài viết trên miti99."
+menu:
+  main:
+    weight: -60
+    params:
+      icon: search
+---

data/profile.yaml

@@ -0,0 +1,14 @@
+name: "miti99"
+handle: "tiennm99"
+tagline: "A developer wants to be magician."
+avatar: "img/avatar.png"
+bio: |
+  Vietnamese developer. Writing about code, work, and the small things in between.
+
+links:
+  - icon: github
+    label: GitHub
+    url: https://github.com/tiennm99
+  - icon: rss
+    label: RSS
+    url: /index.xml