Docs: Rewrite preferences docs (#31154)

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* Update docs/sources/administration/preferences/_index.md

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

* Update docs/sources/administration/preferences/_index.md

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* Update docs/sources/administration/preferences/_index.md

* Update docs/sources/administration/preferences/_index.md

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* Update docs/sources/administration/preferences/_index.md

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* Update change-grafana-name.md

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

docs/sources/shared/preferences/navigate-to-the-dashboard-list.md

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+---
+title: Navigate to the dashboard list
+---
+
+1. Navigate to the dashboard you want to set as the home dashboard.
+1. Click the star next to the dashboard title to mark the dashboard as a favorite if it is not already.

docs/sources/shared/preferences/navigate-user-preferences-list.md

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+---
+title: Navigate to user preferences list
+---
+
+1. On the left menu, hover your cursor over your avatar and then click **Preferences**.

docs/sources/shared/preferences/org-preferences-list.md

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+---
+title: Click Org preferences
+---
+
+1. Hover your cursor over the **Configuration** (gear) icon.
+1. Click **Preferences**.

docs/sources/shared/preferences/select-home-dashboard-list.md

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+---
+title: Select home dashboard list
+---
+
+1. In the **Home Dashboard** field, select the dashboard that you want to use for your home dashboard. Options include all starred dashboards.
+1. Click **Save**.

docs/sources/shared/preferences/select-timezone-list.md

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+---
+title: Select home dashboard list
+---
+
+1. Click to select an option in the **Timezone** list. **Default** is either the browser local timezone or the timezone selected at a higher level. Refer to [Time range controls]({{< relref "../../dashboards/time-range-controls.md" >}}) for more information about Grafana time settings.
+1. Click **Save**.

docs/sources/shared/preferences/select-ui-theme-list.md

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+---
+title: Select the UI theme
+---
+
+1. In the Preferences section, select the **UI theme**.
+1. Click **Save**.

docs/sources/shared/preferences/some-tasks-require-permissions.md

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+---
+title: Some tasks require permissions
+---
+
+Some tasks require certain permissions. For more information about roles, refer to [Permissions]({{< relref "../../permissions/_index.md" >}}).