Which addresses broken URLs.

Due to [0], and fixes several broken links.

[0]: https://www.jvt.me/posts/2019/11/11/gotcha-netlify-lowercase/

Add Getting Started cookbook for SBOMs

See merge request !131

Update github.com/saschagrunert/demo digest to 5fce153, run Go 1.21 in demos, and use `sh` for demos

See merge request !126

As we've now added upstream functionality to override this, we can
remove the reliance on `bash`.

Overhaul + improve documentation site

Closes #198, #154, and #178

See merge request !130

This is a rather large change, and I'd rather not try and break it down
into multiple commits, so here we are.

We want to:

- Add a Concepts section to describe each of the key building blocks
- Add a Cookbooks section to provide common guides
- Add a flowchart for "which tool should I use"
- Add a document on how to deploy the infra
- Migrate the getting started guide from my blog[0]
- Restructure the menu to better fit the new structure
- Reduce some of the content on the homepage

Closes #178, #154, #198.

[0]: https://www.jvt.me/posts/2023/07/25/dmd-getting-started/

Add explicit content licensing to site + update /features/

See merge request !129

As per a discussion in
#167 (comment 1606587809)

As it makes it clearer to read.

Add link to talk video

See merge request !127

Add `db generate missing-data` command

Closes #148

See merge request !125

As part of #77.

As part of #77, we proposed to add support for integration with
`deps.dev` to look up package dependencies.

To do this, we can add support for the `GetDependencies` endpoint on our
`depsdev.Client`, and look up each dependency's dependency tree.

This requires we introduce two new queries to Renovate + SBOMs to be
able to query the existing data, including the full repo + ecosystem
data.

We can copy-paste the existing `Generate` functionality and tweak it to
work for the dependency lookup.

We make sure to trim down the requests we're sending with Renovate data
as there's a lot of data that fails to be looked up without doing so.

For now we can add support for the Maven ecosystem which appears to be
the biggest concern, as Renovate nor SBOM exports we've got include the
full dependency tree.

Co-authored-by: Jamie Tanna <jamie.tanna@elastic.co>

Add a `licenses` report

Closes #185

See merge request !124

To make it easier to see at-a-glance what licenses are in use, we can
surface this via a new `licenses` report.

We also make sure to allow filtering by the `platform`, `org` and `repo.

Closes #185.

As we've had it live for a couple of releases.

Add `contrib sync` command

Closes #144

See merge request !123

To allow syncing just the contrib data, we can add a new `contrib sync`
command.

This also moves it from `advisory` to `contrib`, as it makes most sense
to be owned by `contrib`.

Closes #144.

Warn if re-initialising the same database

Closes #177

See merge request !122

Because this is a bit of a gotcha, as we don't purposefully implement
migrations, we should make sure to let a user know.

In the cases that the existing database is running a version that
contains the `metadata` table, we can output that, and if running an
older version, we need to handle that too.

Closes #177.

Fix: Use correct Datasource for Cargo

Closes #187

See merge request !121

Closes #187.