docs: update notes for tag and folder listings

Author: jackyzha0

content/features/folder and tag listings.md

@@ -14,12 +14,16 @@ Additionally, Quartz will also generate pages for subfolders. Say you have a not
 
 By default, Quartz will title the page `Folder: <name of folder>` and no description. You can override this by creating an `index.md` file in the folder with the `title` [[authoring content#Syntax|frontmatter]] field. Any content you write in this file will also be used in the description of the folder.
 
+For example, for the folder `content/posts`, you can add another file `content/posts/index.md` to add a specific description for it.
+
 ## Tag Listings
 
 Quartz will also create an index page for each unique tag in your vault and render a list of all notes with that tag.
 
 Quartz also supports tag hierarchies as well (e.g. `plugin/emitter`) and will also render a separate tag page for each layer of the tag hierarchy. It will also create a default global tag index page at `/tags` that displays a list of all the tags in your Quartz.
 
+Like folder listings, you can also provide a description and title for a tag page by creating a file for each tag. For example, if you wanted to create a custom description for the #component tag, you would create a file at `content/tags/component.md` with a title and description.
+
 ## Customization
 
 The layout for both the folder and content pages can be customized. By default, they use the `defaultListPageLayout` in `quartz.layouts.ts`. If you'd like to make more involved changes to the layout and don't mind editing some [[creating components|Quartz components]], you can take a look at `quartz/components/pages/FolderContent.tsx` and `quartz/components/pages/TagContent.tsx` respectively.

content/migrating from Quartz 3.md

@@ -34,5 +34,8 @@ When running `npx quartz create`, you will be prompted as to how to initialize y
 
 - You will need to update your deploy scripts. See the [[hosting]] guide for more details.
 - Ensure that your default branch on GitHub is updated from `hugo` to `v4`.
+- [[folder and tag listings|Folder and tag listings]] have also changed.
+  - Folder descriptions should go under `content/<folder-name>/index.md` where `<folder-name>` is the name of the folder.
+  - Tag descriptions should go under `content/tags/<tag-name>.md` where `<tag-name>` is the name of the tag.
 - Some HTML layout may not be the same between Quartz 3 and Quartz 4. If you depended on a particular HTML hierarchy or class names, you may need to update your custom CSS to reflect these changes.
 - If you customized the layout of Quartz 3, you may need to translate these changes from Go templates back to JSX as Quartz 4 no longer uses Hugo. For components, check out the guide on [[creating components]] for more details on this.

quartz/styles/base.scss

@@ -45,7 +45,6 @@ ul,
 }
 
 .math {
-  font-size: 1.1rem;
   &.math-display {
     text-align: center;
   }