[DEN-2026] add gold sponsor, fix logos

[themightymuppet]

• looks like nostarchpress logo was removed accidentally? added that back in and cleaned up the certdirectory logo from DEN-2026 Add Gold Sponsor; Update Tier Name #15886
• added teleport as a gold sponsor for denver 2026

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[toshywoshy]

You're missing a data file, please add a file in data/sponsors/nostarchpress.yml with the name, url and any other information you want or need

[toshywoshy]

You're missing a data file, please add a file in data/sponsors/nostarchpress.yml with the name, url and any other information you want or need

As you're the only event using this sponsor, it is fine to just change the logo, otherwise we would need a old and new version.
This is mearly for information that I adding this second part, the first part is important to add a sponsor data file

[themightymuppet]

@toshywoshy that file already exists in the PR I linked in the description:

looks like nostarchpress logo was removed accidentally? added that back in and cleaned up the certdirectory logo from #15886

The original logo name uploaded had camel case which was breaking the linter. When we renamed it, it removed the old one without adding it back with the new name so it was missing from the linked pr at the time of merge. We also added both sponsors as new in that same linked PR so there was no need to make an old/new version. This was mostly to fix a previous merge and to add a new sponsor to our page.