feat: if site param has show all pages in home option, then home rend…

[nolleh]

…er all pages

What does this PR change? What problem does it solve?
in index page, there isn't function to add all pages.
if user set site.params.ShowAllPagesInHome as true, then use $page as site.RegularPages

Was the change discussed in an issue or in the Discussions before?
as long as I find, no.

PR Checklist

• This change adds/updates translations and I have used the template present here.
• I have enabled maintainer edits for this PR.
• I have verified that the code works as described/as intended.
• This change adds a Social Icon which has a permissive license to use it.
• This change does not include any CDN resources/links.
• This change does not include any unrelated scripts such as bash and python scripts.
• This change updates the overridden internal templates from HUGO's repository.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud