website/integrations: add hashicorp vault integration to website (#2363)

* add hashicorp vault

basic instructions for hashicorp vault

* removed auth0, updated redirect_uri's

removed auth0, updated redirect_uri's to include localhost

* Add hashicorp vault to app list

Add hashicorp-vault to the applications sidebar

website/integrations/services/hashicorp-vault/index.md

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+---
+title: Hashicorp Vault
+---
+
+## What is Vault
+
+From https://vaultproject.io
+
+:::note
+Secure, store and tightly control access to tokens, passwords, certificates, encryption keys for protecting secrets and other sensitive data using a UI, CLI, or HTTP API.
+:::
+
+:::note
+This is based on authentik 2022.2.1 and Vault 1.9.3. Instructions may differ between versions. This guide does not cover vault policies. See https://learn.hashicorp.com/tutorials/vault/oidc-auth?in=vault/auth-methods for a more in depth vault guide
+:::
+
+## Preparation
+
+The following placeholders will be used:
+
+- `authentik.company` is the FQDN of authentik.
+- `vault.company` is the FQDN of Vault.
+
+### Step 1
+
+In authentik, create an _OAuth2/OpenID Provider_ (under _Resources/Providers_) with these settings:
+
+:::note
+Only settings that have been modified from default have been listed.
+:::
+
+**Protocol Settings**
+
+- Name: Vault
+- Signing Key: Select any available key
+
+- Redirect URIs/Origins:
+```
+https://vault.company/ui/vault/auth/oidc/oidc/callback
+https://vault.company/oidc/callback
+http://localhost:8250/oidc/callback
+```
+:::note
+Take note of the `Client ID` and `Client Secret`, you'll need to give them to Vault in _Step 3_.
+:::
+
+### Step 2
+
+In authentik, create an application (under _Resources/Applications_) which uses this provider. Optionally apply access restrictions to the application using policy bindings.
+
+:::note
+Only settings that have been modified from default have been listed.
+:::
+
+- Name: Vault
+- Slug: vault-slug
+- Provider: Vault
+
+### Step 3
+
+Enable the oidc auth method
+```vault auth enable oidc```
+
+Configure the oidc auth method, oidc discovery url is the OpenID Configuration Issuer in your provider
+```
+vault write auth/oidc/config \
+         oidc_discovery_url="https://authentik.company/application/o/vault-slug/" \
+         oidc_client_id="Client ID" \
+         oidc_client_secret="Client Secret" \
+         default_role="reader"
+```
+
+Create the reader role
+```
+vault write auth/oidc/role/reader \
+      bound_audiences="Client ID" \
+      allowed_redirect_uris="https://vault.company/ui/vault/auth/oidc/oidc/callback" \
+      allowed_redirect_uris="https://vault.company/oidc/callback" \
+      allowed_redirect_uris="http://localhost:8250/oidc/callback" \
+      user_claim="sub" \
+      policies="reader"
+```
+
+You should then be able to sign in via OIDC
+```vault login -method=oidc role="reader"```