chore: add titles in some examples

examples/css-less/doczrc.js

@@ -1,6 +1,7 @@
 import { css } from 'docz-plugin-css'
 
 export default {
+  title: 'CSS Less',
   plugins: [
     css({
       preprocessor: 'less',

examples/css-postcss/doczrc.js

@@ -1,6 +1,7 @@
 import { css } from 'docz-plugin-css'
 
 export default {
+  title: 'CSS PostCSS',
   plugins: [
     css({
       preprocessor: 'postcss',

examples/css-sass/doczrc.js

@@ -2,6 +2,7 @@ import { css } from 'docz-plugin-css'
 
 export default {
   plugins: [
+    title: 'CSS Sass',
     css({
       preprocessor: 'sass',
       cssmodules: true,

examples/css-stylus/doczrc.js

@@ -2,6 +2,7 @@ import { css } from 'docz-plugin-css'
 
 export default {
   plugins: [
+    title: 'CSS Styles',
     css({
       preprocessor: 'stylus',
       cssmodules: true,

examples/typescript/doczrc.js

@@ -1,3 +1,4 @@
 module.exports = {
+  title: 'Docz Typescript',
   typescript: true,
 }