Rebuild pkgdown docs (incorporate TileDB branch dev->main)

[jdblischak]

• Rebuilds the docs to incorporate the changes from Update _pkgdown.yml logo link #794 and Fix nightly build by updating branch name from "dev" to "main" #797 via Rscript -e "pkgdown::build_site()" (I used my local R 4.4.2 with pkgdown 2.1.1 on Ubuntu 22)
• Longer-term the plan is to automate the building and deployment of the pkgdown docs (Consider moving the pkgdown process and docs to separate workflows, and update deployment #798), but this PR simply rebuilds them as before to meet the immediate needs of fixing the current website problems
• I also updated vignettes/introduction.md. I had thought this was the generated file, but in fact its corresponding .Rmd is generated by vignettes/Makefile

[jdblischak]

I rebased onto main (e07151c) to incorporate the latest docs updates from #783. Then I rebuilt the pkgdown site with Rscript -e "pkgdown::build_site()"

[jdblischak]

@johnkerl @mojaveazure @cgiachalis please review

[johnkerl]

Unintentional downgrade?

[jdblischak]

Unintentional yes. That just happens to be the version of pandoc installed by APT in my Ubuntu Jammy setup. We'll reduce this type of churn when we move the pkgdown build to GitHub Actions (#798)

[johnkerl]

@jdblischak do you have permission to merge on this repo?

[jdblischak]

do you have permission to merge on this repo?

@johnkerl No, I don't have any permissions on this repo. That's why I had to tag you in a comment instead of assigning you as a reviewer