fix(curriculum): add isHidden: false to challenges

This includes certificates (where it does nothing), but does not
include any translations.

curriculum/challenges/english/01-responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed.english.md

@@ -2,6 +2,7 @@
 id: 587d78ab367417b2b2512af1
 title: Add Flex Superpowers to the Tweet Embed
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c9W7MhM'
 forumTopicId: 301100
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-align-items-property.english.md

@@ -2,6 +2,7 @@
 id: 587d78ad367417b2b2512af8
 title: Align Elements Using the align-items Property
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c8aggtk'
 forumTopicId: 301101
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-justify-content-property.english.md

@@ -2,6 +2,7 @@
 id: 587d78ac367417b2b2512af6
 title: Align Elements Using the justify-content Property
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c43gnHm'
 forumTopicId: 301102
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-a-column-in-the-tweet-embed.english.md

@@ -2,6 +2,7 @@
 id: 587d78ac367417b2b2512af5
 title: Apply the flex-direction Property to Create a Column in the Tweet Embed
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cnzdVC9'
 forumTopicId: 301103
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-rows-in-the-tweet-embed.english.md

@@ -2,6 +2,7 @@
 id: 587d78ab367417b2b2512af3
 title: Apply the flex-direction Property to Create Rows in the Tweet Embed
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cJb8yuq'
 forumTopicId: 301104
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.english.md

@@ -2,6 +2,7 @@
 id: 587d78ab367417b2b2512af0
 title: 'Use display: flex to Position Two Boxes'
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cgz3QS7'
 forumTopicId: 301105
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-items-property-in-the-tweet-embed.english.md

@@ -2,6 +2,7 @@
 id: 587d78ad367417b2b2512af9
 title: Use the align-items Property in the Tweet Embed
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cd3PNfq'
 forumTopicId: 301106
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.english.md

@@ -2,6 +2,7 @@
 id: 587d78af367417b2b2512b00
 title: Use the align-self Property
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cMbvzfv'
 forumTopicId: 301107
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-basis-property-to-set-the-initial-size-of-an-item.english.md

@@ -2,6 +2,7 @@
 id: 587d78ae367417b2b2512afd
 title: Use the flex-basis Property to Set the Initial Size of an Item
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c3d9nCa'
 forumTopicId: 301108
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-column.english.md

@@ -2,6 +2,7 @@
 id: 587d78ac367417b2b2512af4
 title: Use the flex-direction Property to Make a Column
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cZmWeA4'
 forumTopicId: 301109
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.english.md

@@ -2,6 +2,7 @@
 id: 587d78ab367417b2b2512af2
 title: Use the flex-direction Property to Make a Row
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cBEkbfJ'
 forumTopicId: 301110
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-grow-property-to-expand-items.english.md

@@ -2,6 +2,7 @@
 id: 587d78ae367417b2b2512afc
 title: Use the flex-grow Property to Expand Items
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c2p78cg'
 forumTopicId: 301111
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.english.md

@@ -2,6 +2,7 @@
 id: 587d78ae367417b2b2512afe
 title: Use the flex Shorthand Property
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cbpW2tE'
 forumTopicId: 301112
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shrink-property-to-shrink-items.english.md

@@ -2,6 +2,7 @@
 id: 587d78ad367417b2b2512afb
 title: Use the flex-shrink Property to Shrink Items
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cd3PBfr'
 forumTopicId: 301113
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column.english.md

@@ -2,6 +2,7 @@
 id: 587d78ad367417b2b2512afa
 title: Use the flex-wrap Property to Wrap a Row or Column
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cQv9ZtG'
 forumTopicId: 301114
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-justify-content-property-in-the-tweet-embed.english.md

@@ -2,6 +2,7 @@
 id: 587d78ac367417b2b2512af7
 title: Use the justify-content Property in the Tweet Embed
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/c43GgTa'
 forumTopicId: 301115
 ---

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-order-property-to-rearrange-items.english.md

@@ -2,6 +2,7 @@
 id: 587d78ae367417b2b2512aff
 title: Use the order Property to Rearrange Items
 challengeType: 0
+isHidden: false
 videoUrl: 'https://scrimba.com/p/pVaDAv/cMbvNAG'
 forumTopicId: 301116
 ---