fix: restore LaTeX subscripts on Ramanujan exponent constant page

[Chessing234]

Summary

• Restore normal LaTeX subscripts in the 56a constant description (C_{56}, \delta_2).
• Complements fix: wrap GL_2 in math mode in 56a page title #115 (title math mode); merged fix: escape inline subscripts on Ramanujan exponent constant page #110 escaped underscores in the description line.

Test plan

• Open the 56a constant page and confirm subscripts render in the description.

Made with Cursor

[Chessing234]

Same regression from #110 on the description line — C_{56} and δ_2 were rendering with backslashes. (#115 only fixed the title.)