Promote headings on README

Author: maxwofford

README.md

@@ -8,11 +8,11 @@
 
 _The Zephyr passing Rocky Flats, Colorado._
 
-### Securing the Train
+## Securing the Train
 
 _TBC_
 
-### The Launch & Applications
+## The Launch & Applications
 
 Launching the Hacker Zephyr began with this [cryptic video](https://twitter.com/hackclub/status/1396881237113966594) that we tweeted on the 24th of May. We'd follow this tweet up with a collection of more [cryptic tweets](assets/teasers.md), Tom Preston-Warner even created a [few of his own](assets/teasers.md#toms)!
 
@@ -26,7 +26,7 @@ Those invited were [called](applications/invite_call_script.md) to receive the n
 
 Following this we'd invite them to a private channel, coordinate with them on travel arrangements, have them or their parents sign a [liability release](applications/liability_release.pdf) and for those under-18 have their parents sign the ["Freedom Waiver"](applications/freedom_waiver.pdf). After all this and packing, they were ready to enter the [Hackerland](notes/2021-06-29_hackerland.md) in Vermont.
 
-### ZephyrNET & the Hackathon
+## ZephyrNET & the Hackathon
 
 Large parts of the train route across the country would be without wifi or cellular access. Amtrak provides wifi, but their wifi is generally not connected to the internet except while passing through towns. 
 
@@ -36,11 +36,11 @@ We looked at our favorite hackathons (each wonderful in [their](https://ldjam.co
 
 The hackathon's theme was to build a time capsule– too many hackathons are forgotten the day after the event ends b/c their website goes down & their projects don't work (and usually didn't work by the end of it anyways). Everything on the ZephyrNET would be open-sourced, and everyone would contribute to a public scrapbook (forked from our [community scrapbook](https://scrapbook.hackclub.com) to work offline). The goal was to reach 500 contributions to the time capsule or else delete the folders of members that [volunteered](./zephyrnet/volunteers-to-deletion.md) (an opt-in version of the original idea to `rm -rf` the whole server).
 
-### Building an Adventure of a Lifetime
+## Building an Adventure of a Lifetime
 
 _TBC_
 
-### The Trip
+## The Trip
 
 _TBC_