Revamp docs About section (#24589)

- Drops the Team page for privacy and accuracy. I don't want to pressure folks into feeling committed to the project through a page like this, and it also doesn't allow folks any privacy option (as you can hide org membership on your GitHub profile).
- Moves the History page into an Overview page, which includes an updated history page and a quick team blurb at the top.
- Added redirects to the new Overview page from Team and History

_data/nav.yml

@@ -79,8 +79,7 @@
 
 - title: About
   pages:
-    - title: History
-    - title: Team
+    - title: Overview
     - title: Brand
     - title: License
     - title: Translations

docs/4.0/about/overview.md

@@ -1,13 +1,28 @@
 ---
 layout: docs
-title: History
-description: A brief overview of the history of Bootstrap.
-redirect_from: "/docs/4.0/about/"
+title: About
+description: Learn more about the team maintaining Bootstrap, how and why the project started, and how to get involved.
+redirect_from:
+  - "/docs/4.0/about/"
+  - "/docs/4.0/history/"
+  - "/docs/4.0/team/"
 group: about
 ---
 
+## Team
+
+Bootstrap is maintained by a [small team of developers](https://github.com/orgs/twbs/people) on GitHub. We're actively looking to grow this team and would love to hear from you if you're excited about CSS at scale, writing and maintaining vanilla JavaScript plugins, and improving build tooling processes for frontend code.
+
+## History
+
 Originally created by a designer and a developer at Twitter, Bootstrap has become one of the most popular front-end frameworks and open source projects in the world.
 
 Bootstrap was created at Twitter in mid-2010 by [@mdo](https://twitter.com/mdo) and [@fat](https://twitter.com/fat). Prior to being an open-sourced framework, Bootstrap was known as _Twitter Blueprint_. A few months into development, Twitter held its [first Hack Week](https://blog.twitter.com/2010/hack-week) and the project exploded as developers of all skill levels jumped in without any external guidance. It served as the style guide for internal tools development at the company for over a year before its public release, and continues to do so today.
 
 Originally [released](https://blog.twitter.com/2011/bootstrap-from-twitter) on [<time datetime="2011-08-19 11:25">Friday, August 19, 2011</time>](https://twitter.com/mdo/statuses/104620039650557952), we've since had over [twenty releases]({{ site.repo }}/releases), including two major rewrites with v2 and v3. With Bootstrap 2, we added responsive functionality to the entire framework as an optional stylesheet. Building on that with Bootstrap 3, we rewrote the library once more to make it responsive by default with a mobile first approach.
+
+With Bootstrap 4, we once again rewrote the project to account for two key architectural changes: a migration to Sass and the move to CSS's flexbox. Our intention is to help in a small way to move the web development community forward by pushing for newer CSS properties, fewer dependencies, and new technologies across more modern browsers.
+
+## Get involved
+
+Get involved with Bootstrap development by [opening an issue]({{ site.repo }}/issues/new) or submitting a pull request. Read our [contributing guidelines]({{ site.repo }}/blob/v{{ site.current_version }}/.github/CONTRIBUTING.md) for information on how we develop.

docs/4.0/about/team.md

@@ -1,22 +0,0 @@
----
-layout: docs
-title: Team
-description: An overview of the founding team and core contributors to Bootstrap.
-group: about
----
-
-Bootstrap is maintained by the founding team and a small group of invaluable core contributors, with the massive support and involvement of our community.
-
-<div class="list-group bd-team">
-  {% for member in site.data.core-team %}
-    <div class="list-group-item">
-      <iframe class="github-btn" src="https://ghbtns.com/github-btn.html?user={{ member.user }}&amp;type=follow"></iframe>
-      <a class="team-member" href="https://github.com/{{ member.user }}">
-        <img src="https://secure.gravatar.com/avatar/{{ member.gravatar }}" alt="@{{ member.user }}" width="32" height="32">
-        <strong>{{ member.name }}</strong> <small>@{{ member.user }}</small>
-      </a>
-    </div>
-  {% endfor %}
-</div>
-
-Get involved with Bootstrap development by [opening an issue]({{ site.repo }}/issues/new) or submitting a pull request. Read our [contributing guidelines]({{ site.repo }}/blob/v{{ site.current_version }}/.github/CONTRIBUTING.md) for information on how we develop.