[ahmedhamidawan]

Various updates for the GCC2027 site:

• Add registration prices to the Register page: a conference rate table (Student / postdoc, Academic / Non-profit / Government, Industry × Early bird / Regular / Late, with the Feb 28 / May 14 / Jun 13 cut-offs in the headers), an "Add up your week" breakdown (Training Day + conference + dinner + CoFest) with a worked example, the virtual attendance price, and a note that taxes are added during registration
• Add a Discounts section to the bottom of the Register page: the low-income country 50% discount (as in GCC2024) and the GTN trainer / Scientific Program Committee discount code
• Remove the Lodging section from the Register page
• Fill in the final dates: registration and abstract submission open Nov 15, 2026; registration cut-offs; talk (Apr 15) and poster/demo (May 17) abstract deadlines. Updated on the Key Dates, Register, Abstracts and home pages, and the Abstracts and Fellowships key dates are now status-icon tables like the Key Dates page
• Add the organizing committee email (gcc-org@lists.galaxyproject.org) wherever pages ask visitors to contact the organizers (Abstracts, Fellowships, Sponsors, Organizers)
• Fix the missing border on the "Save the date" / CoFest date badges: the border-2 utility is no longer in the generated CSS, so the badges now use an inline border style

Follow up is to add the cancellation policy, once confirmed by @jvessio1.

#4575 (draft) builds on this PR to move the key dates table styling into shared CSS.

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