Remove Bootstrap examples unused in Boosted

package.json

@@ -48,7 +48,6 @@
     "css-prefix": "npm-run-all --aggregate-output --parallel css-prefix-*",
     "css-prefix-main": "postcss --config build/postcss.config.js --replace \"dist/css/*.css\" \"!dist/css/*.rtl*.css\" \"!dist/css/*.min.css\"",
     "css-prefix-examples": "postcss --config build/postcss.config.js --replace \"site/content/**/*.css\"",
-    "css-prefix-examples-rtl": "cross-env-shell NODE_ENV=RTL postcss --config build/postcss.config.js --dir \"site/content/docs/$npm_package_config_version_short/examples/\" --ext \".rtl.css\" --base \"site/content/docs/$npm_package_config_version_short/examples/\" \"site/content/docs/$npm_package_config_version_short/examples/{blog,carousel,dashboard,cheatsheet}/*.css\" \"!site/content/docs/$npm_package_config_version_short/examples/{blog,carousel,dashboard,cheatsheet}/*.rtl.css\"",
     "fonts": "cross-env mkdir -p dist/fonts && cp -r ./fonts/* dist/fonts/",
     "img": "cross-env mkdir -p dist/img && cp -r ./img/* dist/img/",
     "js": "npm-run-all js-compile js-minify",

site/content/docs/5.2/examples/_index.md

@@ -19,14 +19,6 @@ One of the missing examples has priority? Feel free to contact a member of the [
   <div class="bd-content col-lg-3">
     <h2 id="{{ $entry.category | urlize }}">{{ $entry.category }}</h2>
     <p>{{ $entry.description }}</p>
-    {{ if eq $entry.category "RTL" -}}
-      <div class="bd-callout bd-callout-warning small">
-        <p>
-          <strong>RTL is still experimental</strong> and will evolve with feedback. Spotted something or have an improvement to suggest?
-        </p>
-        <p><a href="{{ $.Site.Params.repo }}/issues/new/choose">Please open an issue.</a></p>
-      </div>
-    {{ end -}}
   </div>
 
   <div class="col-lg-9">