Change license to BSD 3-Clause, on the basis of:

See merge request !16

- Riccardo: "I've spoken to GloBee, and they are fine with the licensing, as long as it's liberal (BSD 3-clause / MIT preferred)." ([link](ccs-front#5 (comment 11150)))
- Also have confirmation separately in multiple places from Rehrar that he's happy with permissive licensing.

On that basis, am proposing to change the license to BSD 3-Clause, which is the same licence that the rest of the Monero site uses.

There wasn't an intentional decision at the start that this work should be copyrighted, but it was, and now we can fix that.

Wallet: skip txes containing locked outputs

See merge request !15

MoneroNotify: 'height' argument might be undefined (wallet:notify)

See merge request !14

GenerateAddresses: skip already used address or subaddress index

See merge request !13

api: fix 'projects' endpoint, don't paginate, always return JSON

Closes monero-site#689

See merge request !12

proposals: allow overriding 'gitlab_url' for fr/wp/cp projects

See merge request !11

proposals: hide fr/wip/cp proposals if .md file doesn't exist

See merge request !10

Fix multi-destination deposits

Closes ccs-proposals#4

See merge request !8

deposit: 'deposit:list' cmd to print all deposits info to stdout

See merge request !9

- Updated Header and Footer to match rest of the site

sort proposals by date

See merge request !7

donate: fix FFS mention

See merge request !5

project: fix raised_amount, drop amount_received field

See merge request !3

readme: don't use package manager to install Composer

See merge request !2

drop GITLAB_ACCESS_TOKEN requirement

See merge request !1