Home Refresh

:warning: Don't merge yet, PR is mainly to show it on the staging server :warning: 

Changes include:

- [x] Video in hero
- [x] New intro text
- [x] New Features text
- [x] A Simple Example
- [x] Workflow
- [x] Themes
- [x] New footer
- [x] Some styling tweaks

Still to do:

- [ ] Create intro video, or remove the sample video till the intro video is done
- [ ] Review content. For example the Workflow section, not even sure if it makes sense. Just thought it's important to mention `minit` and `mop` somewhere.
- [ ] Review all the copy. It's mostly just a draft.
- [ ] Review all illustrations. For example under Workflow, the beanstalk for `initialize` or a ship for `ship`, might be a little cheesy. For shipping we could show some devices instead.