Refactor search builder

[Tijawk]

• upgrade dependencies and add MiniSearch as search engine
• remove options.ts. Options are merge in index.ts directly.
• remove baseSrc, docsPath and partialsToIgnore and add translations options.
• refactor searchBuilder to use VITEPRESS_CONFIG.pages
• rename preambuleTransformer to dataTransformer
• rename FileSearchData type to IndexedData
• add DataTransformer and Options type files
• move search logic to useSimpleSearch to allow create custom Search.vue component
• move styles in assets/simpleSearch.css
• remove vue-tsc and add vite-plugin-dts to build .d.ts files
• update README.md
• add unit tests and github CI

New options

export type Options = {
  /**
   * Absolute path to search component.
   *
   * @default 'vitepress-plugin-simple-search/SimpleSearch.vue'
   * @type {string}
   * @memberof Options
   * @example 'absolute/path/to/MyCustomSearch.vue'
   */
  searchComponentPath?: string;

  /**
   * Search options to customize the search behavior.
   *
   * @type {SearchOptions}
   * @memberof Options
   */
  searchOptions?: SearchOptions;

  /**
   * Used to transform the generated data for each page.
   * This is useful if you want to add additional data to the search index.
   * By default search is scanning 'title' and 'text' field only.
   * You can add additional fields to the search index by using searchOptions.
   *
   * @type {(data: IndexedData) => IndexedData | Promise<IndexedData> | undefined}
   * @memberof Options
   */
  transform?: (data: IndexedData) => IndexedData | Promise<IndexedData>;
  
  /**
   * Maximum number of characters to display in the preview.
   * 
   * @default 64
   * @type {number}
   * @memberof Options
   */
  previewLength?: number;

  /**
   * Loading text on search component.
   *
   * @default 'Loading...'
   * @type string
   * @memberof Options
   */
  loadingText?: string;

  /**
   * Search text on navbar.
   *
   * @default 'Search...'
   * @type string
   * @memberof Options
   */
  searchText?: string;

  /**
   * Placeholder text on search input.
   *
   * @default 'Search. Use double quotes for stricter results.'
   * @type string
   * @memberof Options
   */
  placeholderText?: string;

  /**
   * Text to display when no results are found.
   *
   * @default 'No results found.'
   * @type string
   * @memberof Options
   */
  noResultsText?: string;

  /**
   * Text to display when search is complete.
   *
   * @default '{time}ms for {count} results'
   * @type string
   * @memberof Options
   */
  searchTimeText?: string;
};

[Stuyk]

Is this ready for review now?

[Tijawk]

@Stuyk I will add some unit tests and I'm looking on minisearch package for the search engine. Do you agree to let me use this package instead of custom search engine ?

https://www.npmjs.com/package/minisearch

[Stuyk]

@Tijawk I think it's fine to replace the search; the implementation I put in was enough for my needs. :)

[Tijawk]

@Stuyk You can take a quick look on my PR.

If it's ok, I will rebase commits to have a more readable git history and make it ready to final review

[Stuyk]

I had quite a few issues on my side; but after a little bit of work I did manage to get it working. Here's what I had to change to make it compatible.

I have no idea why but the Map type was just giving out tons of errors / issues.

Replacing with an Object seemed to have resolved all of it.

[Stuyk]

Works pretty well overall; but I only have a handful of issues with the changes.

1. Variables are displayed from front matter and are not parsed.

Before:

After:

2. Useless content is being appended to the search results.
3. Initial search data, or random pages are not show outright when opening the search.

[Stuyk]

I'm not sure we need pursue this offline search functionality any further after Vitepress finally added offline search with minisearch.

You can see the merged PR here: vuejs/vitepress#2110

This repository is likely going to get archived after this.