The content on brave://settings/braveHelpTips disappears upon reload and direct access via the address bar

[spylogsster]

Resolves brave/brave-browser#22736

• Fixed navigation issue with /braveHelpTips to create it inside ADVANCED as well as adjacent nodes.
• Little refactoring from obsolete template generation to more fresh approach.

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

• same as in issue

[fallaciousreasoning]

LGTM

[stephendonner]

Verified PASSED using

Brave	1.43.20 Chromium: 103.0.5060.114 (Official Build) nightly (x86_64)
Revision	a1c2360c5b02a6d4d6ab33796ad8a268a6128226-refs/branch-heads/5060@{#1124}
OS	macOS Version 13.0 (Build 22A5295i)

Tested both cases from the original testplan at brave/brave-browser#22736 (comment)

Case 1

1. Open brave://settings/braveHelpTips via the address bar.
2. Observe the content of the page.

Case 2

1. Open brave://settings/.
2. Click on Additional settings from the settings menu. (note: now expanded by default, in all Chromium versions since)
3. Click on Help tips.
4. Reload the page.

Confirmed defaults:

• Show Wayback Machine prompt on 404 pages set to Enabled
• Warn me before closing window with multiple tabs set to Enabled
• Show warning before quitting with command-Q is set to Disabled

direct load of brave://settings/braveHelpTips	Dark	Light