add mfm support

src/components/blog/BlogEntry.svelte

@@ -17,7 +17,7 @@
   import { isoDate, longDate, stampDate } from '$lib/util/time'
   import { extractYouTubeVideoIds } from '$lib/util/youtube'
   import Avatar from '../common/Avatar.svelte'
-  import RichText from '../common/RichText.svelte'
+  import MfmContent from '../common/MfmContent.svelte'
   import Attachments from './Attachments.svelte'
   import PollView from './PollView.svelte'
   import PreviewCardView from './PreviewCardView.svelte'
@@ -181,7 +181,7 @@
     {#if entry.spoiler_text}
       <details class="content-warning">
         <summary class="content-warning-summary">{entry.spoiler_text}</summary>
-        <RichText
+        <MfmContent
           html={entry.content}
           emojis={entry.emojis}
           mentions={entry.mentions}
@@ -194,7 +194,7 @@
         <YouTubeEmbeds videoIds={youtubeVideoIds} sensitive={entry.sensitive} />
       </details>
     {:else}
-      <RichText
+      <MfmContent
         html={entry.content}
         emojis={entry.emojis}
         mentions={entry.mentions}