fix: Many Broken Links

[lfavreli]

Hello Gravitee team!

Yesterday I sent a Pull Request to correct some broken links in the document (#337).

Today I see that there are 4 more broken links, here: developer-portal.

I'll let you correct this one and check the other pages. 🙏

See you soon,
Loïc

[lfavreli]

More broken links, here:

creating-and-maintaining-applications-with-gravitee-developer-portal

Hope this helps! 👌
Loïc

[lfavreli]

Hello,

Other broken links: Applying policies to your APIs.

Have a nice day!
Loïc