Some fixes

- Render markdown descriptions
- Don't include the cover in the album's images, but make sure we
  generate a thumbnail for it
- Make extra sure we don't include slides dirs

Cargo.lock

@@ -431,6 +431,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getopts"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.16"
@@ -881,6 +890,7 @@ dependencies = [
  "image",
  "log",
  "mktemp",
+ "pulldown-cmark",
  "rayon",
  "serde",
  "serde_yml",
@@ -959,6 +969,25 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e8bbe1a966bd2f362681a44f6edce3c2310ac21e4d5067a6e7ec396297a6ea0"
+dependencies = [
+ "bitflags 2.9.0",
+ "getopts",
+ "memchr",
+ "pulldown-cmark-escape",
+ "unicase",
+]
+
+[[package]]
+name = "pulldown-cmark-escape"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "007d8adb5ddab6f8e3f491ac63566a7d5002cc7ed73901f72057943fa71ae1ae"
+
 [[package]]
 name = "qoi"
 version = "0.4.1"
@@ -1438,12 +1467,24 @@ dependencies = [
  "unic-common",
 ]
 
+[[package]]
+name = "unicase"
+version = "2.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75b844d17643ee918803943289730bec8aac480150456169e647ed0b576ba539"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.2"