Broken link fixes in website docs

[itsgreggreg]

This PR fixes all the broken links in the docs on the website. This PR does not attempt to change any language unless where the link was pointing to no longer exists. This means that some of the content in support.md#initialization is outdated, some of the content in view.md is outdated, and possibly other content too.

fixes: #17

[MartinKavik]

note: Once you are ready for code review, please squash commits and rebase your branch onto the current Seed's master. We are rebasing PRs onto master so we don't want to have commits like Merge branch master into 17/doc_link_fixes in our commit history. Thank you.

[itsgreggreg]

Squashed and rebased and good to go for review.

[David-OConnor]

Good stuff. And good to know you can put latest in the Rust docs url.

[MartinKavik]

• I reopened the associated issue because broken link linter isn't implemented and there will be probably more broken links in the future.
• @David-OConnor Please rebase instead of creating merge commits.
• latest vs fixed (Broken links #17 (comment)) - There are problems with both - fixed isn't updated but it can't be broken; latest can be easily broken but we don't need to update it for each Seed version. In ideal world, we should use fixed links and have branch for each Seed version and allow users to switch between them on the website.