OKTA-476264 Adding SIW variable

[thomascavanagh-okta]

Description:

• What's changed? Added a variable which fetches the latest version of the Sign-in Widget. Added to places in docs which explicitly mention the latest version.
• Is this PR related to a Monolith release? No

Resolves:

• OKTA-476264

[acrolinxdevdocs-okta]

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Select Total score to review the Acrolinx scorecard for your article. Try to increase your individual scores, for example: Correctness. Your content will be clearer and more consistent.

Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/guides/archive-embedded-siw/main/index.md	60	27	63	37	88
✅ packages/@okta/vuepress-site/docs/guides/embedded-siw/main/index.md	81	36	70	95	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-common-download-setup-app/main/aspnet/widgetforyourapp.md	87	34	79	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-common-download-setup-app/main/go/widgetforyourapp.md	77	31	76	100	76
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-common-download-setup-app/main/java/widgetforyourapp.md	83	51	100	81	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-common-download-setup-app/main/nodejs/widgetforyourapp.md	91	40	100	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-sdk-use-case-custom-pwd-recovery-mfa/main/aspnet/siw.md	72	52	69	57	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-sdk-use-case-custom-pwd-recovery-mfa/main/nodeexpress/siw.md	64	36	53	82	82
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-widget-use-case-load/main/aspnet/integrationsteps.md	81	31	74	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-widget-use-case-load/main/go/integrationsteps.md	61	28	56	79	79
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-widget-use-case-load/main/java/integrationsteps.md	82	32	100	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-embedded-widget-use-case-load/main/nodejs/integrationsteps.md	86	30	72	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-upgrade-sign-in-widget/main/index.md	83	48	73	92	100

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