[chore] tweak NoLLaMas proof-of-work algorithm (#4090)

# Description

- tweaks the NoLLaMas proof-of-work algorithm to further granularity on time spent computing solutions
- standardizes GoToSocial cookie security directive setting in a CookiePolicy{} type

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4090
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

web/template/nollamas.tmpl

@@ -21,7 +21,8 @@
 <main>
     <section class="nollamas"
         data-nollamas-challenge="{{ .challenge }}"
-        data-nollamas-difficulty="{{ .difficulty }}"
+        data-nollamas-difficulty1="{{ .difficulty1 }}"
+        data-nollamas-difficulty2="{{ .difficulty2 }}"
     >
         <h1>Checking you're not a creepy crawler...</h1>
         <noscript>