refactor: remove legacy stuff

Author: brc-dd

src/node/markdown/math.ts

@@ -60,13 +60,6 @@ export const linkPlugin = (
           hrefAttr[1] = `${base}${hrefAttr[1]}`.replace(/\/+/g, '/')
         }
       }
-
-      // encode vite-specific replace strings in case they appear in URLs
-      // this also excludes them from build-time replacements (which injects
-      // <wbr/> and will break URLs)
-      hrefAttr[1] = hrefAttr[1]
-        .replace(/\bimport\.meta/g, 'import%2Emeta')
-        .replace(/\bprocess\.env/g, 'process%2Eenv')
     }
     return self.renderToken(tokens, idx, options)
   }

src/node/markdown/plugins/link.ts

@@ -16,7 +16,6 @@ import {
   resolveAliases
 } from './alias'
 import { resolvePages, resolveUserConfig, type SiteConfig } from './config'
-import { mathjaxElements } from './markdown/math'
 import {
   clearCache,
   createMarkdownToVueRenderFn,
@@ -88,7 +87,7 @@ export async function createVitePressPlugin(
 
   if (markdown?.math) {
     isCustomElement = (tag) => {
-      if (mathjaxElements.includes(tag)) {
+      if (['mjx-container', 'mjx-assistive-mml'].includes(tag)) {
         return true
       }
       return userCustomElementChecker?.(tag) ?? false