Feature/rss feed (#192)

* installed @11ty/eleventy-plugin-rss package and added it to the config

* adding default rss template from the 11ty documentation

* using 'definedWords' as a collection, not 'posts'

* added a link to the feed in the html head, on the homepage so it's co-located with the other means of engagement, and in the feed itself (permalink is now part of metadata too)

* metadata.description is what we want to show as the feed subtitle, and made the author name safe as part of the metadata json; can't use the safe filter otherwise xml blows up

* removed redundant --- from right below the frontmatter, which md turns into a <hr>, which makes xml blow up

* made indentation consistent

* removing subscribe link from the CTA box, adding it to the footer next to Documentation link with bullet delimiter; updated site footer's ul style to show list items as display-block elements

* on definition pages, the footer is constrained to have the max width of the sidebar (160px). set grid-column: 1 / -1 to give it the full width to match the home/toc page

* created a new collection for sorting only defined words via their .date value (should be created date unless otherwise specified)

* RSS feed now shows posts in the order used by new definedWordsChronological collection

* reversed sort order as requested

* re-prettier-ifying eleventy.js

Co-authored-by: Oscar <ovlb@users.noreply.github.com>

11ty/definitions/-misia.md

@@ -16,7 +16,7 @@ reading:
   - text: "Anti-Oppression: Anti-Fatmisia"
     href: https://simmons.libguides.com/anti-oppression/anti-fatmisia
 ---
----
+
 from Greek for hate or hatred
 
 ## Use

11ty/definitions/derpy.md

@@ -14,10 +14,10 @@ alt_words:
   - malformed
   - silly
 reading:
- - text: Derp is ableist and offensive
-   href: https://americandramedy.blogspot.com/2013/06/derp-is-ableist-and-offensive-stop.html
- - text: Ableist words and terms to avoid
-   href: https://www.autistichoya.com/p/ableist-words-and-terms-to-avoid.html
+  - text: Derp is ableist and offensive
+    href: https://americandramedy.blogspot.com/2013/06/derp-is-ableist-and-offensive-stop.html
+  - text: Ableist words and terms to avoid
+    href: https://www.autistichoya.com/p/ableist-words-and-terms-to-avoid.html
 ---
 
 clumsy, foolish, unattractive, or otherwise unintelligent act or person.