Adding 'Phone' to Socials (adityatelange#635)

Imrprovements to RSS (adityatelange#319)

* Copy hugo's internal rss template
- loc: https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates/_default/rss.xml

- at commit 5f42590144579c318a444ea2ce46d5c3fbbbfe6e of https://github.com/gohugoio/hugo/

* Add Site image from images param

* Hide search and archives layouts from feed index

* add Description and Summary in RSS as in other templates

rm redundant styleing from profile-mode

share-icons: fix extra uneven padding

post-cover: enable mardownify

 * allows users to add links and stuff adityatelange#17

Readme: link social-icon list wiki