* 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

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

This commit updates the sample Travis CI config used in the docs to
deploy VuePress. Travis CI includes a config linter online and I made
these changes from the feedback from the Travis CI config linter. These
changes work cleanly with the latest API version of Travis CI at time of
commit.
Signed-off-by: NJustin W. Flory <git@jwf.io>

* Add npm ci instructions
fix #1844 

* chore: install textlint

* chore: add textlint rules

* feat: set up configuration file and command

* fix: run textlint on files

* chore: lint .textlintrc.js

* chore: add custom terms

* chore: add comment filter

* fix: fix frontmatter term

* chore: set subjective rules to warning severity

* fix: manually fix issues

* chore: add script as pre-commit hook

set nodejs version to lts