make blog/instance description a SafeString

long_description & short_description's documentation say they can be
Markdown, but they are String, not SafeString.

This led to escaped strings being printed in the editor
https://github.com/Plume-org/Plume/issues/220

plume-models/src/blogs.rs

@@ -22,6 +22,7 @@ use plume_common::activity_pub::{
     inbox::WithInbox,
     sign
 };
+use safe_string::SafeString;
 use instance::*;
 use users::User;
 use schema::blogs;
@@ -142,8 +143,8 @@ impl Blog {
                     name: inst.clone(),
                     local: false,
                     // We don't really care about all the following for remote instances
-                    long_description: String::new(),
-                    short_description: String::new(),
+                    long_description: SafeString::new(&<String>::new()),
+                    short_description: SafeString::new(&<String>::new()),
                     default_license: String::new(),
                     open_registrations: true,
                     short_description_html: String::new(),

plume-models/src/instance.rs

@@ -3,6 +3,7 @@ use diesel::{self, QueryDsl, RunQueryDsl, ExpressionMethods, PgConnection};
 use std::iter::Iterator;
 
 use plume_common::utils::md_to_html;
+use safe_string::SafeString;
 use ap_url;
 use users::User;
 use schema::{instances, users};
@@ -16,8 +17,8 @@ pub struct Instance {
     pub blocked: bool,
     pub creation_date: NaiveDateTime,
     pub open_registrations: bool,
-    pub short_description: String,
-    pub long_description: String,
+    pub short_description: SafeString,
+    pub long_description: SafeString,
     pub default_license : String,
     pub long_description_html: String,
     pub short_description_html: String
@@ -30,8 +31,8 @@ pub struct NewInstance {
     pub name: String,
     pub local: bool,
     pub open_registrations: bool,
-    pub short_description: String,
-    pub long_description: String,
+    pub short_description: SafeString,
+    pub long_description: SafeString,
     pub default_license : String,
     pub long_description_html: String,
     pub short_description_html: String

plume-models/src/users.rs

@@ -205,8 +205,8 @@ impl User {
                     public_domain: inst.clone(),
                     local: false,
                     // We don't really care about all the following for remote instances
-                    long_description: String::new(),
-                    short_description: String::new(),
+                    long_description: SafeString::new(&<String>::new()),
+                    short_description: SafeString::new(&<String>::new()),
                     default_license: String::new(),
                     open_registrations: true,
                     short_description_html: String::new(),