[larnsce]

Summary

• The openwashdata logo on every package site and README (Logo in the package logo slot and the publisher under Citation, instead of the line under the badges #148): use_brand() installs the brand's small logo as the package logo (man/figures/logo.png), which pkgdown shows beside the title and GitHub shows at the README title, writes the dark counterpart with the one pkgdown/extra.css rule for the dark theme, and lists brand.yml in Config/Needs/website so branded sites build on CI (Move 18 package sites to the pkgdown workflow (gh-pages) so they serve llms.txt #143).
• The README template no longer opens with a line under the badges; the publisher is named as the first line of the Citation section with the website written out, and setup_readme() shows the installed logo at the title.
• Version 1.2.2, a GitHub release like 1.2.1; the next CRAN submission carries both. After the merge: tag v1.2.2, dev version bump, then the second pass over the 60 sites (Site branding pass: refresh the 60 package sites with washr 1.2.1 #147 pattern) that applies this and installs the brand everywhere.

Test plan

• devtools::test() with NOT_CRAN: 812 pass, 0 fail
• R CMD check --as-cran --no-manual: 0 errors, 0 warnings, 0 notes
• Three real pkgdown builds of fslogisticskampala with the brand (the chosen layout is the one this PR implements); pkgdown shows one logo when the README title carries the same image
• CI on dev green
• After the merge: tag v1.2.2, usethis::use_dev_version() on dev, merge main into dev, push

Refs #148