Cache better (#296)

* Many improvements around bandwidth use

- Use ETags for RSS/Atom feeds
- Use cache-control headers
- Update to rust nightly (for rust-analyzer and faster builds)
- Limit feeds to the last 20 posts:
  https://twitter.com/theprincessxena/status/1349891678857998339
- Use if-none-match to limit bandwidth further

Also does this:

- bump go_vanity to 0.3.0 and lets users customize the branch name
- fix formatting on jsonfeed
- remove last vestige of kubernetes/docker support

Signed-off-by: Christine Dodrill <me@christine.website>

* expire cache quicker for dynamic pages

Signed-off-by: Christine Dodrill <me@christine.website>

* add rss ttl

Signed-off-by: Christine Dodrill <me@christine.website>

* add blogpost

Signed-off-by: Christine Dodrill <me@christine.website>

1 files changed, 1 insertions, 2 deletions

diff --git a/lib/jsonfeed/src/errors.rs b/lib/jsonfeed/src/errors.rs
index 936b7ec..b94779c 100644
--- a/lib/jsonfeed/src/errors.rs
+++ b/lib/jsonfeed/src/errors.rs
@@ -1,7 +1,6 @@
 use serde_json;
-error_chain!{
+error_chain! {
     foreign_links {
         Serde(serde_json::Error);
     }
 }
-