Possibly incorrect link to main page from "Templates generator"?

The use of the reference `:backends_content` in this line: https://github.com/DiamondLightSource/httomo-backends/blob/a34bf5802fc541ef5a0c541377b000ce596882aa/docs/source/utilities/yaml_generator.rst?plain=1#L5

appears to be wanting to link to the YAML templates that have been generated.

However, while the text of the link is what is expected for a link to YAML templates:

it actually links to the main page, which doesn't seem like what would be intended?

The linking to the main page is likely due to the reference being put in `index.rst`: https://github.com/DiamondLightSource/httomo-backends/blob/a34bf5802fc541ef5a0c541377b000ce596882aa/docs/source/index.rst?plain=1#L3-L9

and should instead be moved to somewhere in the `templates.rst` file.