Add code of conduct and governance pages

See merge request !38

Add Next Generation Internet and ISC to list of funders.

See merge request !37

Update expiry dates of PGP public keys

See merge request !36

Accept donations via Bitcoin Cash

See merge request !35

Add NLnet to list of funders

See merge request !34

Update download page to Briar 1.2

See merge request !33

Fix typo in press release

See merge request !32

Fix F-Droid repo link to work on Chrome and Firefox

See merge request !31

Add Localization Lab's data sharing diagram

See merge request !28

Briar 1.2 release announcement

See merge request !30

building: update instructions for AS 3.5

See merge request !29

- Correct the name to the apk to match the one generated.
- Fix typo on click on, and match the format on the rest of the
instructions instead.

The building from source instructions were written around the time
Android Studio (AS) was version 1.5. Since then, some prompts/options have
been removed or moved around. Thus, users willing to build from source
may get confused with the current instructions. Update the screenshots
to show a more version of AS (3.5), and remove the steps that are not
longer necessary.

Update copyright info, remove broken link

See merge request !27

Feature hugo migration

Closes #1

See merge request !24

* div footer_container should be outside of div wrapper