Replace Salsa with OpenCollective link (#580)

* Update theme
* Use open-collective link instead

README.md

@@ -6,7 +6,7 @@ and served using [Hugo](https://gohugo.io).
 
 ## Build
 
-After installing Hugo, build locally:
+After installing Hugo and Dart Sass, build locally:
 
 ```
 git submodule update --init
@@ -30,8 +30,7 @@ It needs a
 with `read:org` permissions. The token has to be exported as `GH_TOKEN`.
 
 ```
-export GH_TOKEN=xxxxxxxxxx
-make teams
+GH_TOKEN=xxxxxxxxxx make teams
 ```
 
 ## Analytics

content/en/about.md

@@ -88,20 +88,13 @@ making a donation to the project commensurate with your resources. Any
 amount helps!
 
 Donations are managed by the [NumFOCUS](https://numfocus.org)
-foundation, which passes 90% of your contribution to the SciPy project,
+foundation, which passes your contribution to the SciPy project,
 and provides the SciPy development team with basic administrative and
-legal services for the other 10%. NumFOCUS is a 501(c)3 non-profit
+legal services. NumFOCUS is a 501(c)3 non-profit
 foundation, so if you are subject to the US Tax law, your contributions
 are tax-deductible.
 
-<div style="display: block; float:center;">
-   <a href="https://numfocus.salsalabs.org/donate-to-scipy" target="_blank"
-      style="background:#1e87f0;padding:10px;margin:10px 0px;
-             text-decoration:none;font-size:12pt;color:#ffffff;
-             font-family:Arial,Helvetica,sans-serif;display:inline-block;">
-      Donate to SciPy
-   </a>
-</div>
+{{<opencollective>}}
 
 ## Acknowledgements
 

layouts/shortcodes/opencollective.html

@@ -0,0 +1,14 @@
+<div class="opencollective">
+  <a
+    href="https://opencollective.com/scipy#category-CONTRIBUTE"
+    target="_blank"
+  >
+    <img src="/images/logos/opencollective.png" width="300" />
+  </a>
+</div>
+
+<style>
+  .opencollective {
+    padding-top: 0.5rem;
+  }
+</style>