Update logo references across multiple HTML files to use the new MathCodeLab logo. This includes changes to favicon links and sidebar images in various course-related pages for Java, Python, and Mathematics courses.

Co-authored-by: Copilot <copilot@github.com>

Author: orabe

assets/images/code-svgrepo-com.svg

@@ -11,8 +11,10 @@ A professional, scalable certificate verification system for MathCodeLab, using
 ```
 verify/
   index.html
-  verify.css
   verify.js
+assets/
+  css/
+    style.css
 backend/
   app/
     main.py
@@ -56,13 +58,13 @@ backend/
 - `GET /health` — API health check
 - `GET /verify/{certificate_id}` — Verify a certificate
 - `POST /admin/certificates` — Create a certificate (admin, API key required)
-- `PATCH /admin/certificates/{certificate_id}/revoke` — Revoke a certificate (admin, API key required)
+- `DELETE /admin/certificates/{certificate_id}` — Delete a certificate (admin, API key required)
 
 ## Issuing a Certificate
 - Use the admin API or run `python scripts/create_certificate.py` interactively.
 
-## Revoking a Certificate
-- Use the PATCH admin endpoint with a revocation reason.
+## Revocation
+Revocation support has been removed from this codebase. Certificates cannot be revoked via the API.
 
 ## Frontend Integration
 - The verification page (`verify/index.html`) calls the backend API at `https://api.mathcodelab.de/verify/{certificate_id}`.

assets/images/website.png assets/images/mathcodelab_logo.pngassets/images/website.png renamed to assets/images/mathcodelab_logo.png

@@ -0,0 +1,45 @@
+import numpy as np
+import matplotlib.pyplot as plt
+
+np.random.seed(42)
+n = 20
+
+x = np.linspace(0, 1, n)
+
+# gradient
+prob = 0.75 - 0.4 * x
+
+# biased noise
+noise = 0.05 * np.random.randn(n) + 0.08
+prob = prob + noise
+
+prob = np.clip(prob, 0.4, 0.95)
+
+grid = np.random.rand(n, n) < prob
+
+# -----------------------
+# create RGBA image
+# -----------------------
+blue = np.array([57/255, 103/255, 229/255, 1.0])  # #3967E5
+transparent = np.array([0, 0, 0, 0])
+
+rgba = np.zeros((n, n, 4))
+
+for i in range(n):
+    for j in range(n):
+        rgba[i, j] = blue if grid[i, j] else transparent
+
+# -----------------------
+# plot
+# -----------------------
+fig, ax = plt.subplots(figsize=(4, 4))
+ax.imshow(rgba)
+ax.axis("off")
+
+# -----------------------
+# save
+# -----------------------
+plt.savefig("assets/images/mathcodelab_logo.png", dpi=300, bbox_inches="tight", pad_inches=0, transparent=True)
+plt.savefig("assets/images/mathcodelab_logo.svg", bbox_inches="tight", pad_inches=0, transparent=True)
+
+# plt.show()

assets/images/website.svg assets/images/mathcodelab_logo.svgassets/images/website.svg renamed to assets/images/mathcodelab_logo.svg

@@ -41,7 +41,7 @@
             <div class="sidebar-info">
 
                 <figure class="avatar-box">
-                    <img src="./assets/images/website.svg" alt="MathCodeLab" width="80">
+                    <img src="./assets/images/mathcodelab_logo.svg" alt="MathCodeLab" width="80">
                 </figure>
 
                 <div class="info-content">

backend/README.md

@@ -40,7 +40,7 @@
             <div class="sidebar-info">
 
                 <figure class="avatar-box">
-                    <img src="./assets/images/website.svg" alt="MathCodeLab" width="80">
+                    <img src="./assets/images/mathcodelab_logo.svg" alt="MathCodeLab" width="80">
                 </figure>
 
                 <div class="info-content">

create_logo.py

@@ -39,7 +39,7 @@
             <div class="sidebar-info">
 
                 <figure class="avatar-box">
-                    <img src="../assets/images/website.svg" alt="MathCodeLab" width="80">
+                    <img src="../assets/images/mathcodelab_logo.svg" alt="MathCodeLab" width="80">
                 </figure>
 
                 <div class="info-content">

index.html

@@ -39,7 +39,7 @@
             <div class="sidebar-info">
 
                 <figure class="avatar-box">
-                    <img src="../../assets/images/website.svg" alt="MathCodeLab" width="80" width="80">
+                    <img src="../../assets/images/mathcodelab_logo.svg" alt="MathCodeLab" width="80" width="80">
                 </figure>
 
                 <div class="info-content">

laufende_kurse.html

@@ -40,7 +40,7 @@
             <div class="sidebar-info">
 
                 <figure class="avatar-box">
-                    <img src="../../assets/images/website.svg" alt="MathCodeLab" width="80">
+                    <img src="../../assets/images/mathcodelab_logo.svg" alt="MathCodeLab" width="80">
                 </figure>
 
                 <div class="info-content">