add design goals page (#2166)

docs/the_nimbus_book/src/SUMMARY.md

@@ -1,6 +1,6 @@
 # Summary
 - [Introduction](./intro.md)
-- [Philosophy]()
+- [Design goals](./philosophy.md)
 - [System requirements](./hardware.md)
 - [Run just the beacon node (quickstart)](./quick-start.md)
 

docs/the_nimbus_book/src/philosophy.md

@@ -0,0 +1,15 @@
+# Design goals
+
+One of our most important design goals is an application architecture that makes it **simple to embed Nimbus into other software.**
+
+Another is to **minimize reliance on third-party software.**
+
+A third is for the application binary to be as **lightweight as possible in terms of resources used.**
+
+### Integration with Status
+
+<blockquote class="twitter-tweet"><p lang="en" dir="ltr">I can&#39;t wait to run Nimbus straight from Status Desktop <a href="https://twitter.com/hashtag/hyped?src=hash&amp;ref_src=twsrc%5Etfw">#hyped</a></p>&mdash; JARRAÐ HOPΞ (@jarradhope) <a href="https://twitter.com/jarradhope/status/1293473249347555334?ref_src=twsrc%5Etfw">August 12, 2020</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+
+As part of our first design goal, our primary objective here is for Nimbus to be tightly integrated into the [Status messaging app](https://status.im/).
+
+Our dream is for you to be able to run and monitor your validator straight from Status desktop.

docs/the_nimbus_book/src/quick-start.md

@@ -1,6 +1,6 @@
 # Run just the beacon node (quickstart)
 
-This page takes you through how to run just the beacon node without a validator attached.
+This page takes you through how to run just the beacon node **without a validator attached.**
 
 Running a beacon node without a validator attached can help improve the anonymity properties of the network as a whole.