ARFC Moltres website migration

[smpark7]

Fixes #179

Description

This PR migrates existing content on the ARFC Moltres website (https://arfc.github.io/software/moltres/) to the newer MooseDocs-based website (https://arfc.github.io/moltres/). A preview with the changes in this PR is available on my personal github website (https://smpark7.github.io/moltres/index.html).

Changes

• Migrated existing website content
  • Input syntax guide
  • Corresponding terms in the PDEs for each Kernel/BC object
  • Recommended executioner and preconditioner settings guide
• Added more content
  • Additional kernel/BC documentation: The weak form for second-order differential terms which were integrated by parts
  • Gwen's dissertation entry under "Publications"
• Tutorials
  • Moved and edited group constant generation tutorial README instructions into tutorial guides on the new Moltres website
  • Added input files for eigenvalue and transient tutorial problems
  • Added syntax check tests for these new tutorial input files
• Fixes
  • Typo in Publications webpage
  • Improve visibility of dropdown menu in dark mode
  • Removed redundant entry in godiva_serpent.inp

Impact

• More extensive Moltres documentation support with the MooseDocs-based website
• Powerful MooseDocs-based tools which help with website maintenance

[abachma2]

Hi @smpark7. Great work on this, it looks really good overall. I had a few very small suggestions that are optional. I saw that one of the CI tests fails and I didn't really dig into why. I know you have a few PRs right now, so I'm guessing one of those PRs fixes it all. Let me know when this is ready to merge.

[smpark7]

Thanks for your review @abachma2. The CI is failing at the "initialize test environment" phase and I don't know why. This PR sets up new tests but it doesn't touch any source code. I'll ping you when it's been sorted.

[smpark7]

The tests are running properly now. I just added an input mesh for the tutorial which I initially missed because of gitignore. This PR is ready for review and merge (unless you have new comments). @abachma2

[smpark7]

@abachma2 pinging you for a review and merge

[abachma2]

Thanks for the reminder! Merging now.

[smpark7]

Thanks Amanda!