CI step to find broken links

[DistributedDoge]

Making changes to either infrastructure or website can result in broken links on portal website.

As final step of Publish and Deploy workflow we can add "link-checker" github action that visits portal and reports if any broken link was encountered.

Having outdated examples is tolerable, but I want to make sure that Get the Data link on main portal website is always working as intended.

Site links:

• configure ScholliYT/Broken-Links-Crawler-Action@v3 to ignore twitter
• modify action to produce run_summary with broken links.

File links:

• visit IPNS bucket using portal navigation link and try to download something.