website: add docs to website (#2080)

* website: add fontmatter & improve image URLs where necessary

* website: add docs to website

* website: add prismjs for code highlighting

* website: change npm install position in web.sh

* website: fix an image URL in lang/cs/README.md

* website: improve image paths in lang/cs/translations.md

* website: add responsiveness & improve stylings of docs

* website: add dir to navbar in blog & docs

* website: remove scroll in mobile dropdown menu

* website: remove rfcs & add guide docs to website

* website: remove file renaming script from web.sh

* website: add menu to docs in nav

* website: add hash list & add scroll to headers

* website: customize docs frontmatter through JS

* website: remove supported_languages.json

* website: move merge_translations.js to JS folder

* website: add the following changes to docs
- add frontmatter to new doc merged from master
- add ignoreForWeb property to frontmatter of README.md docs

* website: remove package-lock.json from .gitignore

* website: add package-lock.json from .gitignore

* website: add no docs message to docs dropdown

* website: improve the sidebar of docs

* website: add revision date to docs

* website: add script to add version to docs frontmatter

* website: add layout to display message in docs if its version is old

* website: improve nav responsiveness

* website: remove frontmatter form main README & rfcs

* website: remove rfcs from website folder

* website: add ignore condition for rfcs in .eleventy

* website: remove frontmatter from lang README docs

* website: remove README from website's lang docs

* website: add guides menu in nav

* website: following changes
- add docs_dropdown.json
- extend reference menu in nav
- remove docs menu from nav

* website: fix in docs sidebar

* website: revert main docs README.md files

* website: revert main docs README.md files

* website: move scripts out of js that are for build

* website: remove displayAt form guide docs

* website: create a docs_sidebar.json & shift to that approach

* update navigation

* website: set navbar

* website: add icons to external links

* website: change the approach for docs sidebar creation

* website: update docs template

* website: add some strings to en.json and map them accordingly

* remove icon

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

website/src/css/style.css

@@ -182,6 +182,14 @@ img{
   color: #fff;
 }
 
+.nav-link ul li a.active{
+  color: #0053D0;
+
+}
+.dark .nav-link ul li a.active{
+  color: #66D9E2;
+}
+
 @media (min-width:1024px) {
   .nav-link-text,
   .menu-link {
@@ -229,8 +237,13 @@ img{
   color: #505158;
 }
 
-.dark .sub-menu {
-  color: #fff;
+.sub-menu .no-hover{
+  color: #505158 !important;
+}
+
+.dark .sub-menu,
+.dark .sub-menu .no-hover {
+  color: #fff !important;
 }
 
 .dark .sub-menu li:hover {
@@ -282,7 +295,7 @@ header nav {
   }
 
   .active .sub-menu {
-    max-height: 200px;
+    max-height: 600px;
     transform: translateY(0px);
     opacity: 1;
     visibility: visible;