backend/remote: add a new backend for storing state and running operations remotely

By adding this method you now only have to pass a `*disco.Disco` object around in order to do discovery and use any configured credentials for the discovered hosts.

Of course you can also still pass around both a `*disco.Disco` and a `auth.CredentialsSource` object if there is a need or a reason for that!

It’s a purely cosmetic change, but I find it easier to read them like this.

Just providing the hostname won't work. This commit adds an example and fixes
the explanation.

help: Make version and help flags consistent

These flags are presented as POSIX/GNU-style long-form flags
(double-dash), whereas the rest of our CLI flags as seen in sub-commands
are presented as single-dash options.

While both work in both cases (on part of the flag package allowing
double dashes as well), we converge around the single-dash form, so the
basic help text here should be consistent.

website: Correcting terraform custom provider name in community-index.html.markdown

helper/resource: Add ability to pre-taint resources

Corrected the naming of the 'Keboola' provider and shifted it down to keep alphabetical ordering.

It's been a while since we made any significant updates to this page.
The main theme of this revamp is to ensure that we highlight how to
provide "ambient credentials" for each of the module sources using the
standard mechanisms for each source type.

While there, I also attempted a general cleanup to highlight the main
cases and make this less like a detailed description of all of
go-getter's esoteric features, and did some general copy-editing to write
it in our usual documentation "voice".

vendor: terraform-providers/terraform-provider-aws@v1.29.0 and aws/aws-sdk-go@v1.14.31

vendor: Pin aws/aws-sdk-go/service/lexmodelbuildingservice@v1.13.28 and aws/aws-sdk-go/service/organizations@v1.13.28 in vendor.json for consistency

Fix typo in version docs

Fix documentation on tainting resources within modules

Update database-index.html.markdown

It looks like the output does not match the command, in fact.
This pull-request fixes this issue.

Fix repeated word "with with"

Update running-terraform-in-automation.html.md

Fix word ordering

One of the subcommands lists out the existing workspaces.

Add links to important docs (like user tokens), and explain that this isn't part
of our recommended primary workflows anymore.

provisioner/habitat: add missing space for service url

fix spacing for service url.

Based on some feedback on the initial draft, make some minor updates to
how information is presented in the preview upgrade guide for v0.12.

This also includes some minor copy-editing work to try to make the "voice"
more consistent between different sections of the guide.