add oxford link, add package searchdb

package-lock.json

@@ -15,6 +15,7 @@
         "hexo-generator-archive": "^2.0.0",
         "hexo-generator-category": "^2.0.0",
         "hexo-generator-index": "^3.0.0",
+        "hexo-generator-searchdb": "^1.4.1",
         "hexo-generator-sitemap": "^3.0.1",
         "hexo-generator-tag": "^2.0.0",
         "hexo-helper-live2d": "^3.1.1",
@@ -3338,6 +3339,14 @@
         "node": ">=14"
       }
     },
+    "node_modules/hexo-generator-searchdb": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmmirror.com/hexo-generator-searchdb/-/hexo-generator-searchdb-1.4.1.tgz",
+      "integrity": "sha512-7m8IBpZbI6iKb2jRYxs4pghD6Ln8ylQSRGl6MIC4G9wws21vYSXSD8rvC3MoCO+pWBHs6E/mTA/rjG+p2AZfVg==",
+      "dependencies": {
+        "nunjucks": "^3.2.2"
+      }
+    },
     "node_modules/hexo-generator-sitemap": {
       "version": "3.0.1",
       "resolved": "https://registry.npmmirror.com/hexo-generator-sitemap/-/hexo-generator-sitemap-3.0.1.tgz",

package.json

@@ -19,6 +19,7 @@
     "hexo-generator-archive": "^2.0.0",
     "hexo-generator-category": "^2.0.0",
     "hexo-generator-index": "^3.0.0",
+    "hexo-generator-searchdb": "^1.4.1",
     "hexo-generator-sitemap": "^3.0.1",
     "hexo-generator-tag": "^2.0.0",
     "hexo-helper-live2d": "^3.1.1",

source/_posts/2023-04-07-oxford-3000.md

@@ -21,6 +21,8 @@ date: 2023-04-07 13:41:28
 
 The Oxford 3000 is the list of the 3000 most important words to learn in English, from A1 to B2 level.
 
+> The PDF version can be found at [The_Oxford_3000.pdf](https://www.oxfordlearnersdictionaries.com/external/pdf/wordlists/oxford-3000-5000/The_Oxford_3000.pdf).
+
 <!-- more -->
 
 ## A

source/_posts/2023-04-07-oxford-5000.md

@@ -21,6 +21,8 @@ date: 2023-04-07 15:52:19
 
 The Oxford 5000 is an expanded core word list for advanced learners of English. As well as the Oxford 3000, it includes an additional 2000 words for learners at B2-C1 level, which are listed here.
 
+> The PDF version can be found at [The_Oxford_5000.pdf](https://www.oxfordlearnersdictionaries.com/external/pdf/wordlists/oxford-3000-5000/The_Oxford_5000.pdf).
+
 <!-- more -->
 
 ## A