fix(doc-page): page should move to section in URL hash upon reload

[mesqueeb]

reproduction steps:

1. click on a chapter to scroll to it
2. ⌘R to reload
3. the page will reload and stay at the top of the page

• you may need to create a new test page that uses DocPage.vue in planetar/packages/dev to reproduce the issue

desired fix

• fix to be implemented at: DocPage.vue
• have DocPage detect when all examples/sections are mounted. (I'm listening to some events to know about this already)
• then the browser URL hash needs to be obtained and scrolled towards the section.
• use Quasar scroll utils to scroll to the element