* test($shared-utils): cover more cases for unescapeHtml

* test($shared-utils): cover more cases for fileToPath

* test($shared-utils): cover more cases for parseHeaders

* Update deploy.md

Here is my issue: https://github.com/vuejs/vuepress/issues/2584
I've found that node:9.11.1 is too old and in the `Prerequisites` part of the guide, it's recommend to use node 10+ so update a small comment could be useful. I don't know if it is applicable to delete `node:9.11.1` and replace with `node:14.8.0` so I just add a comment

* Update deploy.md

Figuring this out was the first pain point for me in getting started with VuePress. So I think maybe above bar to add a line like this.

This addresses the way the date is parsed, which, when it's a string is causing the input for the Date constructor to assume the date to be in ISO 8601 format (UTC), and when it's a Date, is always UTC.

* docs: bring user straight to the guide

* docs: use index instead of README

* docs: update CTA to go to get started guide

* docs: add update step for generator and remove older warnings

* docs: add warning for webpack 3 with less prominence

* docs: update node prerequisite version

* docs: fix link for create-vuepress

* docs: remove upgrade step

Co-authored-by: NSergey Larionov <sergeylarionov@cloud.upwork.com>

* fix($theme-default): fix editLink for repos hosted on gitlab.com

* refactor($theme-default): refactor the gitlab edit links

* refactor($theme-default): refactor bitbucket edit links

* feat($theme-default): add initial open group index option

Adds an optional property for sidebar groups, so that one can initially display a group other than the first as open. Also allows to initially display all groups as closed, by setting `initialOpenGroupIndex` to `-1`.

* docs: add details on `initialOpenGroupIndex`

* docs: update core team member status

* docs: update active core team list

* fix: allows no rel attribute on external links in the nav

* fix: documents the falsy rel option

* fix: clarifies documentation

* fix: explicitly uses  for rel attr

* fix: removes unnecessary condition
Co-authored-by: NBillyyyyy3320 <newsbielt703@gmail.com>
Co-authored-by: NBillyyyyy3320 <newsbielt703@gmail.com>

Co-authored-by: NBen Hong <ben@bencodezen.io>

Small fix in the markdown

Co-authored-by: Ndependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>