Add synopsis for current front-page articles

_posts/2021-11-01-buggy-glean-and-a-data-incident.md

@@ -8,6 +8,11 @@ data:
   tags:
     - mozilla
     - rust
+  synopsis: |
+    Shortly after we shipped Glean through GeckoView in a Fenix Nightly release
+    we received a crash report pointing to code that we haven't touched in a long time.
+    And yet the change of switching from a standalone Glean library
+    to shipping Glean in GeckoView uncovered a crashing bug, that quickly rose to be the top crasher for Fenix for more than a week
 ---
 
 (“This Week in Glean” is a series of blog posts that the Glean Team at Mozilla is using to try to communicate better about our work. They could be release notes, documentation, hopes, dreams, or whatever: so long as it is inspired by Glean.)

_posts/2021-12-17-glean-in-2021.md

@@ -7,6 +7,11 @@ data:
   route: blog
   tags:
     - mozilla
+  synopsis: |
+    A year ago I posted Glean in 2021 as a way to look into the future
+    and set out a vision and plan for the project.
+    Today I'm looking back at 2021, if we were able to follow up on my plans back then
+    and look at all the other things we did for Glean.
 ---
 
 (“This Week in Glean” is a series of blog posts that the Glean Team at Mozilla is using to try to communicate better about our work. They could be release notes, documentation, hopes, dreams, or whatever: so long as it is inspired by Glean.)

_posts/2021-12-31-2021-in-many-words.md

@@ -5,6 +5,10 @@ published_date: "2021-12-31 23:59:59 +0100"
 layout: post.liquid
 data:
   route: blog
+  synopsis: |
+    It has become a tradition for me to look at the year that's about to end.
+    I did so in 2020, 2019, 2018, 2017, 2016, 2015 and 2014.
+    Let's look at 2021 now
 ---
 
 It has become a tradition for me to look at the year that's about to end.