donate: Cookies and info page, templates tweaks

donate/migrations/0003_donatecookiespage_donateinfopage.py

donate/models.py

donate/templates/donate/base.html

donate/templates/donate/donate_cookies_page.html

donate/templates/donate/donate_home_page.html

donate/templates/donate/donate_info_page.html

donate/templates/donate/donate_project_index_page.html

donate/templates/donate/donate_project_page.html

donate/templates/donate/donate_region_page.html