feat: mvp features for soft launch (#44539)

* refactor: use enum

* feat: create links between legacy and new

* refactor: pull out legacy-links component

* fix: import order

* fix: provide icon for new superblock

* feat: only show the copy on the new superblock

* fix: use the proper i18n keys correctly

* feat: put the new superblock at the end of the map

* feat: update the new superblock title

* test: update for soft launch order

* fix: show original project links on /settings

Soft launch only.

* test: use SHOW_NEW_CURRICULUM in tests

* fix: rename the remaining rwd-22s

* feat: make the messge prettier

* fix: message copy

* refactor: make comment make sense

Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>
Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

client/i18n/locales/english/intro.json

@@ -67,7 +67,7 @@
     }
   },
   "2022/responsive-web-design": {
-    "title": "Responsive Web Design",
+    "title": "Responsive Web Design (Beta)",
     "intro": [
       "In this Responsive Web Design Certification, you'll learn the languages that developers use to build webpages: HTML (Hypertext Markup Language) for content, and CSS (Cascading Style Sheets) for design.",
       "First, you'll build a cat photo app to learn the basics of HTML and CSS. Later, you'll learn modern techniques like CSS variables by building a penguin, and best practices for accessibility by building a web form.",
@@ -672,6 +672,8 @@
     "expand": "Expand courses",
     "collapse": "Collapse courses",
     "legacy-header": "Legacy Courses",
-    "legacy-desc": "These courses are no longer part of the certification path, but are still available for you to further your learning."
+    "legacy-desc": "These courses are no longer part of the certification path, but are still available for you to further your learning.",
+    "viewing-upcoming-change": "You are looking at a beta version of the curriculum. ",
+    "go-back-to-learn": "Go back to the stable version."
   }
 }