Add sitemap for SEO

[smacmullan]

https://developers.google.com/search/docs/crawling-indexing/sitemaps/build-sitemap

Include pages for ward-specific spending breakdown (Example: /ward-spending?ward=2)

[jonathanortega2023]

Added txt file list & xml urlset with existing project URLs, missing URL routing for the 2 map charts. @cehemmerly