Fixed links to features in upgrade to 5.x (#1584)
Fixed links to features in upgrade to 5.x (#1584)

From (bad link):
https://squidfunk.github.io/getting-started/#tabs

To:
https://squidfunk.github.io/mkdocs-material/getting-started/#tabs
squidfunk/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material