Add training material page

[latin-panda]

Is your feature request related to a problem? Please describe.
We've heard a lot of feedback about CHWs completing training cards that appear on load but cannot easily access them to revisit content.
If CHWs close training on load they won’t be shown any cards again until the next day.
Today, the only way to view completed training is to open submitted reports.

Describe the solution you'd like
Figma
The training materials will be accessible from the hamburger menu

Describe alternatives you've considered
We did brainstorming sessions in the form of story maps - the alternatives we considered.

[latin-panda]

@n-orlowski training out the sub-issues feature, I've assigned you one to see how it works