feat: improve Markdown support and add transcript search functionality

- Add `.cache` to `.gitignore` for temporary build files.
- Introduce Markdown snippets for creating Season 1 and Season 5 show notes in `.vscode/markdown.code-snippets`.
- Update `.vscode/settings.json`:
  - Exclude `node_modules` directory.
  - Adjust quick suggestions to disable them for comments, strings, and others.
- Remove unnecessary `console.log` statements from `episodes.11tydata.js`.
- Add an image file `content/episodes/image.jpg`.
- Implement a transcript search feature:
  - Add `search-transcripts.hbs` to enable searching transcript cues with time markers.
  - Add `transcript-index.11ty.js` to generate a searchable transcript index.
- Update `search-index.11ty.js` to skip processing `<hr>` and `<img>` tags.
- Enhance episode layout with `startAt` query parameter to allow audio playback from a specific time.
- Add a new dependency:
  - `@11ty/eleventy-fetch` for fetching transcripts.
  - `media-captions` for parsing and handling transcript files.
- Update package-lock.json and package.json to include new dependencies.

content/episodes/transcript-index.11ty.js

@@ -0,0 +1,31 @@
+import {parseText} from 'media-captions';
+import Fetch from "@11ty/eleventy-fetch";
+import path from 'path';
+
+class SearchIndex {
+  data() {
+    return {eleventyExcludeFromCollections:["episode"], layout: null}
+  }
+
+  async render (data) {
+    const episodesWithTranscript = data.collections.episode.filter(e=>e.data.podcast?.transcriptUrl)
+    const promises = episodesWithTranscript.map((episode)=>{
+      const {transcriptUrl} = episode.data.podcast
+      return Fetch(transcriptUrl, {type:'text', duration: "1d"})
+      .then(srt_buffer=>parseText(srt_buffer.toString(), {type:'srt'}))
+      .then(({cues})=>cues)
+      .then((cues)=>({
+        name: path.basename(transcriptUrl,".srt"), 
+        episode: episode.data.episode,
+        season: episode.data.season,
+        title: episode.data.title,
+        url: `${this.url(episode.url)}`,
+        cues: cues.map(({id, startTime, text})=>({id,startTime,text}))
+      }))
+      })
+    const result = await Promise.all(promises)
+    return JSON.stringify(result)
+  }
+}
+
+export default SearchIndex