Improve readability of embedded templates

[ZhangChengLin]

https://github.com/gohugoio/hugo/blob/9906c1ae52e44f2e8ed45873ea36cd83a9e9bcc0/tpl/tplimpl/embedded/templates/_default/rss.xml#L29-L36

Whether the code can increase the readability, this will not affect the later compression, it should be updated and maintained.

The official documentation feels outdated, so you can only look at the source code. Sometimes the source code is not readable, but Hugo is really easy to use. When can you consider some basic issues.

It's just a personal feeling, if something is wrong, please forgive me, I hope Hugo will get better and better.

[jmooring]

Many (all?) of the embedded templates were created before the release of Go 1.6, which introduced syntax to remove white space ({{- -}}). Tracking progress on this issue...

Templates

• [ ] tpl/tplimpl/embedded/templates/disqus.html
• [ ] tpl/tplimpl/embedded/templates/twitter_cards.html
• [x] tpl/tplimpl/embedded/templates/alias.html
• [x] tpl/tplimpl/embedded/templates/google_analytics.html
• [x] tpl/tplimpl/embedded/templates/opengraph.html
• [x] tpl/tplimpl/embedded/templates/pagination.html
• [x] tpl/tplimpl/embedded/templates/schema.html

Shortcodes

• [x] tpl/tplimpl/embedded/templates/shortcodes/figure.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/gist.html
• [ ] tpl/tplimpl/embedded/templates/shortcodes/highlight.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/instagram.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/instagram_simple.html
• [ ] tpl/tplimpl/embedded/templates/shortcodes/param.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/ref.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/relref.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/twitter.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/twitter_simple.html
• [ ] tpl/tplimpl/embedded/templates/shortcodes/vimeo.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/vimeo_simple.html
• [x] tpl/tplimpl/embedded/templates/shortcodes/youtube.html

Render hooks

• [x] tpl/tplimpl/embedded/templates/_default/_markup/render-codeblock-goat.html
• [x] tpl/tplimpl/embedded/templates/_default/_markup/render-image.html
• [x] tpl/tplimpl/embedded/templates/_default/_markup/render-link.html

Partials

• [x] tpl/tplimpl/embedded/templates/partials/_funcs/get-page-images.html

Other

• [ ] tpl/tplimpl/embedded/templates/_default/rss.xml
• [ ] tpl/tplimpl/embedded/templates/_default/sitemap.xml
• [x] tpl/tplimpl/embedded/templates/_default/sitemapindex.xml