Release notes: SpyFu v4.21

** Bugs Fixed
* [SF-19288] – Login – Username field can be left blank
* [SF-19324] – Recon – Modal should allow users to finish wizard
* [SF-19342] – Fix escaped html in recon wizard
* [SF-19376] – UK Side of Site has Subscription Costs on Receipts in Pounds

** Story
* [SF-19251] – AdWords Templates – Create product page
* [SF-19252] – AdWords Templates – Getting Started page
* [SF-19253] – Super Login Component – Lvl 9000
* [SF-19254] – AdWords Templates – Download Page
* [SF-19255] – AdWords Templates – Create S3 Bucket, upload stuff and build API that queries it

** Improvement
* [SF-17941] – HQ – Links to tools should use router-link
* [SF-17951] – Kombat – Input domain validation
* [SF-18995] – Internal – Make IAA components functional
* [SF-19126] – Overview: Add right arrow icon to domain overview
* [SF-19189] – Normalize vertical spacing on backlinks empty message
* [SF-19290] – MySpyFu – Comments, file names, and test specs should reflect new history functionality