Update about page (#392)

* Add some lesson links

* Simpler about

* Small tweak

public/content/about.mdx

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 # About the Channel
 
-<Portrait image="images/about/channel.png" size="250px" flip={true} />
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-3blue1brown, or 3b1b for short, is primarily a [YouTube channel](https://www.youtube.com/3blue1brown) about discovery and creativity in math.
+3blue1brown, or 3b1b for short, is primarily a [YouTube channel](https://www.youtube.com/3blue1brown) about discovery and creativity in math, with an emphasis on visualizations.
 On this site, you can find written versions of many of these lessons, often with more interactive elements sprinkled in.
 
-Topics tend to fall into one of two categories:
+Some lessons cover standard topics people may be searching for, such as <LessonLink id="vectors">linear algebra</LessonLink>, <LessonLink id="neural-networks">neural networks</LessonLink>, <LessonLink id="essence-of-calculus">calculus</LessonLink>, <LessonLink id="fourier-transforms">Fourier transforms</LessonLink>, <LessonLink id="light-quantum-mechanics">quantum mechanics</LessonLink> and many more.
 
-- Those people might be seeking out, like linear algebra, neural networks, calculus, Fourier transforms, quantum mechanics, etc.
-- Problems in math which many people may not have heard of, and which seem quite challenging at first, but where some shift in perspective makes it both doable and beautiful.
+Other lessons <LessonLink id="clacks">are</LessonLink> <LessonLink id="inscribed-rectangle-problem">more</LessonLink> <LessonLink id="hardest-problem">purely</LessonLink> <LessonLink id="prime-spirals">playful</LessonLink>, exploring puzzles and problems with some intrinsic beauty, particularly those which seem quite challenging at first, but where some shift in perspective makes it both doable and beautiful.
+
+The first category aims to motivate math by its usefulness, and the second aims to motivate math as an art form, though of course, the line dividing these two is easily blurred.
 
-Loosely speaking, the first category motivates math by its usefulness, and the second motivates math as an art form.
-But of course, the line dividing these two is easily blurred.
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 # About the Author
 
-<Portrait image="images/about/grant.png" size="250px" />
+<Portrait image="images/about/grant.png"/>
 
 My name is Grant Sanderson.
 These videos, and the [animation engine](https://github.com/3b1b/manim) behind them, began as side projects as I was wrapping up my time studying math and computer science at Stanford.
+After graduating, I worked for Khan Academy producing videos, articles and exercises, primarily focussed on multivariable calculus. Since the end of 2016, my primary focus has been on 3blue1brown and its associated projects.
 
-From there, I was fortunate enough to start forging a less traditional path into math outreach thanks to Khan Academy's talent search, which led me to make videos and write articles about multivariable calculus and a few other miscellaneous topics for them until the end of 2016.
-Since then, my main focus has been on 3b1b.
+In those years, I've also had the pleasure of contributing to a number of different outlets for math exposition, including spending a semester lecturing for an MIT course on computational thinking, contributing a Netflix documentary about infinity, writing for Quanta, and collaborating with many other educational YouTube channels.
 
-While the majority of my work has been on these videos and the related projects around them, along the way I've had the pleasure of working with numerous other outlets in education and outreach including Quanta, Manning, Udacity, Itempool, and the Julia Lab at MIT.
-Even on YouTube, some of my favorite projects in the past years have been the ones done in collaboration with others, including videos with Numberphile, Stand-up Maths, MinutePhysics, Physics Girl, Ben Eater, Smarter Every Day, and others.
-
-If you're curious to hear more about my background and thoughts surrounding these projects, you may enjoy [various](https://youtu.be/A0RH93XvSyU) [podcasts](https://youtu.be/U_lKUK2MCsg) I've been a guest on.
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-# Contributors
+# Contributors, past and present
 
 ### Kurt Bruns, Artist