[docs] Rework getting license key

[z9r5]

Description

• Don't store the license key in a cookie;
• Change form for requesting license key;
• Dim page content if EE is chosen but license key is not entered.

Checklist

• [ ] The code is covered by unit tests.
• [ ] e2e tests passed.
• [ ] Documentation updated according to the changes.
• [ ] Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: docs
type: fix
summary: Reworked getting and entering license keys on the site.
impact_level: low

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 3m11s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 1m21s.

Workflow details

:red_circle: Deploy web to test for deckhouse:rework-getting-license-key failed in 3m3s. :fast_forward: Deploy web to test for deckhouse:rework-getting-license-key started.

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 4m45s.

Workflow details

:red_circle: Deploy web to test for deckhouse:rework-getting-license-key failed in 50s. :fast_forward: Deploy web to test for deckhouse:rework-getting-license-key started.

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 6m18s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 47s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to test for deckhouse:rework-getting-license-key succeeded in 5m29s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to stage for deckhouse:rework-getting-license-key succeeded in 57s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to stage for deckhouse:rework-getting-license-key succeeded in 1m38s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to stage for deckhouse:rework-getting-license-key succeeded in 2m5s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to stage for deckhouse:rework-getting-license-key succeeded in 1m32s.

[deckhouse-BOaTswain]

:green_circle: Deploy web to stage for deckhouse:rework-getting-license-key succeeded in 2m10s.