feat: add doc for Titles and Link components (#64)

Author: tonai

builtin/components.md

@@ -4,28 +4,21 @@
 
 > The documentations of this section is still working in progress. Before that, you can take a look at the [source code](https://github.com/slidevjs/slidev/blob/main/packages/client/builtin) directly.
 
-### `TOC`
+### `Toc`
 
 Insert a Table Of Content.
 
-Titles and title levels get automatically retrieved from the first title element of each slides.
-
-You can override this automatic behaviour for a slide by using the front matter syntax:
-```yml
----
-title: Amazing slide title
-level: 2
----
-```
-
-Or if you prefer the slide to not appear in the TOC at all, you can use:
+If you want a slide to not appear in the `<Toc>` component, you can use in the front matter block of the slide:
 ```yml
 ---
 hideInToc: true
 ---
 ```
 
+Titles are displayed using the [`<Titles>` component](#titles)
+
 #### Usage
+
 ~~~md
 <Toc />
 ~~~
@@ -41,6 +34,52 @@ Parameters:
   * `'onlyCurrentTree'`: Display only items that are in current tree (active item, parents and children of active item)
   * `'onlySiblings'`: Display only items that are in current tree and their direct siblings
 
+### `Link`
+
+Insert a link you can use to navigate to a given slide.
+
+#### Usage
+
+~~~md
+<Link to="42">Go to slide 42</Link>
+<Link to="42" title="Go to slide 42"/>
+~~~
+
+Parameters:
+
+* `to` (`string | number`): The path of the slide to navigate to (slides starts from `1`)
+* `title` (`string`): The title to display
+
+### `Titles`
+
+Insert the main title from a slide parsed as HTML.
+
+Titles and title levels get automatically retrieved from the first title element of each slides.
+
+You can override this automatic behaviour for a slide by using the front matter syntax:
+```yml
+---
+title: Amazing slide title
+level: 2
+---
+```
+
+#### Usage
+
+The `<Titles>` component is a virtual component you can import with:
+```js
+import Titles from '/@slidev/titles.md'
+```
+
+Then you can use it with:
+~~~md
+<Titles no="42" />
+~~~
+
+Parameters:
+
+* `no` (`string | number`): The number of the slide to display the title from (slides starts from `1`)
+
 ## Custom Components
 
 Create a directory `components/` under your project root, and simply put your custom Vue components under it, then you can use it with the same name in your markdown file!