i18n(ru): update some translations

[dragomano]

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Tracked Files

File	Note
ru/basics/astro-pages.mdx	Localization changed, will be marked as complete.
ru/concepts/islands.mdx	Localization changed, will be marked as complete.
ru/concepts/why-astro.mdx	Localization changed, will be marked as complete. 🔄️
ru/develop-and-build.mdx	Localization added, will be marked as complete.
ru/getting-started.mdx	Localization changed, will be marked as complete. 🔄️
ru/guides/dev-toolbar.mdx	Localization changed, will be marked as complete.
ru/guides/migrate-to-astro/index.mdx	Localization changed, will be marked as complete.
ru/guides/testing.mdx	Localization changed, will be marked as complete.
ru/guides/upgrade-to/v3.mdx	Localization changed, will be marked as complete.
ru/guides/view-transitions.mdx	Localization changed, will be marked as complete.
ru/install-and-setup.mdx	Localization changed, will be marked as complete. 🔄️
ru/tutorial/6-islands/1.mdx	Localization changed, will be marked as complete.
ru/tutorial/6-islands/2.mdx	Localization changed, will be marked as complete.
ru/tutorial/6-islands/index.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[yanthomasdev]

Thanks @dragomano, a few of these pages got outdated in the meantime (see the 🔄️) mark. Could you take a look and update them accordingly? 🙌

[yanthomasdev]

Thanks @dragomano, just one final thing: looks like the Astro pages translation is missing the custom error 500 page section and its subheading. Could you take a look and update accordingly?