Modify Readme syntax (#17112)

* Modify syntax

* Change ** bold to ### header

* Revert license edit

README.md

@@ -37,42 +37,42 @@ Click below to **learn more** in a video:
 
 <img src="https://docs.joinmastodon.org/elephant.svg" align="right" width="30%" />
 
-**No vendor lock-in: Fully interoperable with any conforming platform**
+### No vendor lock-in: Fully interoperable with any conforming platform
 
-It doesn't have to be Mastodon, whatever implements ActivityPub is part of the social network! [Learn more](https://blog.joinmastodon.org/2018/06/why-activitypub-is-the-future/)
+It doesn't have to be Mastodon; whatever implements ActivityPub is part of the social network! [Learn more](https://blog.joinmastodon.org/2018/06/why-activitypub-is-the-future/)
 
-**Real-time, chronological timeline updates**
+### Real-time, chronological timeline updates
 
-See the updates of people you're following appear in real-time in the UI via WebSockets. There's a firehose view as well!
+Updates of people you're following appear in real-time in the UI via WebSockets. There's a firehose view as well!
 
-**Media attachments like images and short videos**
+### Media attachments like images and short videos
 
-Upload and view images and WebM/MP4 videos attached to the updates. Videos with no audio track are treated like GIFs; normal videos are looped - like vines!
+Upload and view images and WebM/MP4 videos attached to the updates. Videos with no audio track are treated like GIFs; normal videos loop continuously!
 
-**Safety and moderation tools**
+### Safety and moderation tools
 
-Private posts, locked accounts, phrase filtering, muting, blocking and all sorts of other features, along with a reporting and moderation system. [Learn more](https://blog.joinmastodon.org/2018/07/cage-the-mastodon/)
+Mastodon includes private posts, locked accounts, phrase filtering, muting, blocking and all sorts of other features, along with a reporting and moderation system. [Learn more](https://blog.joinmastodon.org/2018/07/cage-the-mastodon/)
 
-**OAuth2 and a straightforward REST API**
+### OAuth2 and a straightforward REST API
 
-Mastodon acts as an OAuth2 provider so 3rd party apps can use the REST and Streaming APIs, resulting in a rich app ecosystem with a lot of choices!
+Mastodon acts as an OAuth2 provider, so 3rd party apps can use the REST and Streaming APIs. This results in a rich app ecosystem with a lot of choices!
 
 ## Deployment
 
-**Tech stack:**
+### Tech stack:
 
 - **Ruby on Rails** powers the REST API and other web pages
 - **React.js** and Redux are used for the dynamic parts of the interface
 - **Node.js** powers the streaming API
 
-**Requirements:**
+### Requirements:
 
 - **PostgreSQL** 9.5+
 - **Redis** 4+
 - **Ruby** 2.5+
 - **Node.js** 12+
 
-The repository includes deployment configurations for **Docker and docker-compose**, but also a few specific platforms like **Heroku**, **Scalingo**, and **Nanobox**. The [**stand-alone** installation guide](https://docs.joinmastodon.org/admin/install/) is available in the documentation.
+The repository includes deployment configurations for **Docker and docker-compose** as well as specific platforms like **Heroku**, **Scalingo**, and **Nanobox**. The [**standalone** installation guide](https://docs.joinmastodon.org/admin/install/) is available in the documentation.
 
 A **Vagrant** configuration is included for development purposes. To use it, complete following steps:
 
@@ -85,7 +85,7 @@ A **Vagrant** configuration is included for development purposes. To use it, com
 
 Mastodon is **free, open-source software** licensed under **AGPLv3**.
 
-You can open issues for bugs you've found or features you think are missing. You can also submit pull requests to this repository, or submit translations using Crowdin. To get started, take a look at [CONTRIBUTING.md](CONTRIBUTING.md). If your contributions are accepted into Mastodon, you can request to be paid through [our OpenCollective](https://opencollective.com/mastodon).
+You can open issues for bugs you've found or features you think are missing. You can also submit pull requests to this repository or submit translations using Crowdin. To get started, take a look at [CONTRIBUTING.md](CONTRIBUTING.md). If your contributions are accepted into Mastodon, you can request to be paid through [our OpenCollective](https://opencollective.com/mastodon).
 
 **IRC channel**: #mastodon on irc.libera.chat