DF: User confusion: 2 pages with the same name. The fix is quick:)

[trentmc]

Background / motivation

Here is the link to the DF rewards page, expanding the sidebar to include 7 sub-pages of "DF User Guides".

Screenshot of sidebar:

Some datapoints:

• There are two pages with the name "Curate with Volume DF": (1) in the main section, and (2) in "DF User Guides" subsection. The first has "about" content, the second has "howto" content
• ... "Predict with Challenge DF" ....

Problems:

1. User confusion: 2 pages with name "Curate with Volume DF"
2. User confusion: 2 pages with name "Predict with Challenge DF"
3. "Curate with Volume DF" page in main section does not link its "about" counterpart. It should do so, and prominently. (FYO "Challenge DF" does link, good.)

TODO

(There are heavier ways to fix this. Let's keep it lightweight and surgical.)

• [ ] For "Curate with Volume DF" page in "DF User Guides" section: Add "How to" or "Guide: " to its title such that overall title is "How to Curate with Volume DF" or "Guide: Curate with Volume DF".
• [ ] For ["Predict with Challenge DF" page in "DF User Guides" section]((https://docs.oceanprotocol.com/rewards/user-guides/how-to-challengedf): Add "How to" or "Guide:" to its title
• [ ] For "Curate with Volume DF" page in main section: add a prominent link to the ["Curate with Volume DF" page in "DF User Guides" section.