docs: Optimize 11 showcase thumbnail images

25 files changed, 7 insertions, 7 deletions

diff --git a/docs/content/showcase/balaramadurai.net.md b/docs/content/showcase/balaramadurai.net.md
index 08d5c0dc9..ca4a7c71e 100644
--- a/docs/content/showcase/balaramadurai.net.md
+++ b/docs/content/showcase/balaramadurai.net.md
@@ -7,6 +7,6 @@ sitelink: http://balaramadurai.net
 tags:
 - personal
 - blog
-thumbnail: /img/balaramadurai-net-tn.png
+thumbnail: /img/balaramadurai-net-tn.jpg
 title: Dr. Bala Ramadurai | Professor & Consultant in Innovation, Design Thinking and Tech Forecasting
 ---
diff --git a/docs/content/showcase/christianmendoza.md b/docs/content/showcase/christianmendoza.md
index 46f72e96c..6d18735d9 100644
--- a/docs/content/showcase/christianmendoza.md
+++ b/docs/content/showcase/christianmendoza.md
@@ -9,6 +9,6 @@ sourceLink: https://github.com/christianmendoza/christianmendoza.me
 tags:
 - personal
 - profile
-thumbnail: /img/christianmendoza-tn.png
+thumbnail: /img/christianmendoza-tn.jpg
 title: christianmendoza.me
 ---
diff --git a/docs/content/showcase/neavey.net.md b/docs/content/showcase/neavey.net.md
index d9a4bb654..443d2b670 100644
--- a/docs/content/showcase/neavey.net.md
+++ b/docs/content/showcase/neavey.net.md
@@ -9,6 +9,6 @@ tags:
 - personal
 - travel
 - blog
-thumbnail: /img/neavey-tn.png
+thumbnail: /img/neavey-tn.jpg
 title: neavey.net
 ---
diff --git a/docs/content/showcase/robertbasic.md b/docs/content/showcase/robertbasic.md
index f27cb8d85..237fce837 100644
--- a/docs/content/showcase/robertbasic.md
+++ b/docs/content/showcase/robertbasic.md
@@ -9,7 +9,7 @@ sourceLink: https://github.com/robertbasic/robertbasic.com-hugo
 tags:
 - personal
 - blog
-thumbnail: /img/robertbasic-tn.jpg
+thumbnail: /img/robertbasic-tn.png
 title: Robert Basic's blog
 ---
 
diff --git a/docs/content/showcase/stefano.chiodino.md b/docs/content/showcase/stefano.chiodino.md
index 1a6477a91..5880eb9ed 100644
--- a/docs/content/showcase/stefano.chiodino.md
+++ b/docs/content/showcase/stefano.chiodino.md
@@ -8,7 +8,7 @@ sourceLink: https://github.com/Draga/go-web
 tags:
 - personal
 - blog
-thumbnail: /img/stefano.chiodino-tn.png
+thumbnail: /img/stefano.chiodino-tn.jpg
 title: stefano.chiodino.uk
 ---
 
diff --git a/docs/content/showcase/thecodeking.md b/docs/content/showcase/thecodeking.md
index dc70f28cf..86786d736 100644
--- a/docs/content/showcase/thecodeking.md
+++ b/docs/content/showcase/thecodeking.md
@@ -7,7 +7,7 @@ sitelink: http://thecodeking.co.uk
 tags:
 - personal
 - blog
-thumbnail: /img/thecodeking-tn.png
+thumbnail: /img/thecodeking-tn.jpg
 title: thecodeking
 ---
 
diff --git a/docs/content/showcase/yulinling.net.md b/docs/content/showcase/yulinling.net.md
index e85a1ad2f..b5a6559f1 100644
--- a/docs/content/showcase/yulinling.net.md
+++ b/docs/content/showcase/yulinling.net.md
@@ -9,6 +9,6 @@ sourceLink: https://bitbucket.org/lynxiayel/yulinling_source_public
 tags:
 - blog
 - documentation
-thumbnail: /img/yulinling-tn.png
+thumbnail: /img/yulinling-tn.jpg
 title: <span lang="zh-CN">语林灵</span> (Yulinling)
 ---
diff --git a/docs/static/img/balaramadurai-net-tn.jpg b/docs/static/img/balaramadurai-net-tn.jpg
new file mode 100644
index 000000000..207a4a840
--- /dev/null
+++ b/docs/static/img/balaramadurai-net-tn.jpg
diff --git a/docs/static/img/balaramadurai-net-tn.png b/docs/static/img/balaramadurai-net-tn.png
deleted file mode 100644
index bedfa0724..000000000
--- a/docs/static/img/balaramadurai-net-tn.png
+++ /dev/null
diff --git a/docs/static/img/christianmendoza-tn.jpg b/docs/static/img/christianmendoza-tn.jpg
new file mode 100644
index 000000000..434d9dc54
--- /dev/null
+++ b/docs/static/img/christianmendoza-tn.jpg
diff --git a/docs/static/img/christianmendoza-tn.png b/docs/static/img/christianmendoza-tn.png
deleted file mode 100644
index fd7627c33..000000000
--- a/docs/static/img/christianmendoza-tn.png
+++ /dev/null
diff --git a/docs/static/img/dbzman-online-tn.png b/docs/static/img/dbzman-online-tn.png
index 281336be9..eb9d4ea0c 100644
--- a/docs/static/img/dbzman-online-tn.png
+++ b/docs/static/img/dbzman-online-tn.png
diff --git a/docs/static/img/heimatverein-niederjosbach-tn.png b/docs/static/img/heimatverein-niederjosbach-tn.png
index a7308ec9c..f47425b7e 100644
--- a/docs/static/img/heimatverein-niederjosbach-tn.png
+++ b/docs/static/img/heimatverein-niederjosbach-tn.png
diff --git a/docs/static/img/losslesslife-tn.png b/docs/static/img/losslesslife-tn.png
index ddc317301..cc9e286aa 100644
--- a/docs/static/img/losslesslife-tn.png
+++ b/docs/static/img/losslesslife-tn.png
diff --git a/docs/static/img/lucumt.info.png b/docs/static/img/lucumt.info.png
index 8bd46e8ae..15a3a213d 100644
--- a/docs/static/img/lucumt.info.png
+++ b/docs/static/img/lucumt.info.png
diff --git a/docs/static/img/neavey-tn.jpg b/docs/static/img/neavey-tn.jpg
new file mode 100644
index 000000000..6f81fcb69
--- /dev/null
+++ b/docs/static/img/neavey-tn.jpg
diff --git a/docs/static/img/neavey-tn.png b/docs/static/img/neavey-tn.png
deleted file mode 100644
index df31aee3a..000000000
--- a/docs/static/img/neavey-tn.png
+++ /dev/null
diff --git a/docs/static/img/robertbasic-tn.jpg b/docs/static/img/robertbasic-tn.jpg
deleted file mode 100644
index 37f038f77..000000000
--- a/docs/static/img/robertbasic-tn.jpg
+++ /dev/null
diff --git a/docs/static/img/robertbasic-tn.png b/docs/static/img/robertbasic-tn.png
new file mode 100644
index 000000000..5ceecfead
--- /dev/null
+++ b/docs/static/img/robertbasic-tn.png
diff --git a/docs/static/img/stefano.chiodino-tn.jpg b/docs/static/img/stefano.chiodino-tn.jpg
new file mode 100644
index 000000000..7747798d5
--- /dev/null
+++ b/docs/static/img/stefano.chiodino-tn.jpg
diff --git a/docs/static/img/stefano.chiodino-tn.png b/docs/static/img/stefano.chiodino-tn.png
deleted file mode 100644
index 1c8573252..000000000
--- a/docs/static/img/stefano.chiodino-tn.png
+++ /dev/null
diff --git a/docs/static/img/thecodeking-tn.jpg b/docs/static/img/thecodeking-tn.jpg
new file mode 100644
index 000000000..158384d4e
--- /dev/null
+++ b/docs/static/img/thecodeking-tn.jpg
diff --git a/docs/static/img/thecodeking-tn.png b/docs/static/img/thecodeking-tn.png
deleted file mode 100644
index 69f87064e..000000000
--- a/docs/static/img/thecodeking-tn.png
+++ /dev/null
diff --git a/docs/static/img/yulinling-tn.jpg b/docs/static/img/yulinling-tn.jpg
new file mode 100644
index 000000000..bdb12f0e7
--- /dev/null
+++ b/docs/static/img/yulinling-tn.jpg
diff --git a/docs/static/img/yulinling-tn.png b/docs/static/img/yulinling-tn.png
deleted file mode 100644
index 150bcac7d..000000000
--- a/docs/static/img/yulinling-tn.png
+++ /dev/null