content/page/coc: add Code of Conduct

As discussed in the team meeting, adopt Alpine's code of conduct.

Related: https://wiki.postmarketos.org/wiki/Core_Team_Meetings#2021-10-13

content/page/coc.md

+title: "Code of Conduct"
+---
+The [Alpine Linux Code of Conduct](https://www.alpinelinux.org/community/code-of-conduct.html)
+is followed in postmarketOS.
+
+Alpine is the distribution we are based on, and
+our communities work closely together. The CoC is reasonable, it boils down to
+using your brain and being nice to each other. It is what we have been living
+since the project was started, for example people who were rude towards others
+have been kicked from chats.
+
+It helps to have this written down in detail, and when interacting with Alpine
+you should be aware of this anyway. So it made sense to adopt this CoC for
+postmarketOS.

static/img/icons-numix/system-users-symbolic.svg

+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+ <g transform="matrix(0.0675,0,0,0.06923077,0.16000023,14)" style="fill:#353535">
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+ </g>
+ <g transform="matrix(0.0525,0,0,0.05192308,-4.3199998,11)" style="fill:#353535">
+  <path d="m 141 -154.07 55.57 0 0 77.04 38.1 38.519 l -57.14 38.519 l 0 19.259 -76.19 0 0 -26.667 39.668 -21.481 0 -28.889 c 0 0 -20.693 -8.116 -20.62 -19.259 l 0 -57.778 c 0 0 1.572 -19.259 20.62 -19.259 z" style="color:#000"/>
+ </g>
+ <g transform="matrix(0.075,0,0,0.075,-17.780636,12.526475)" style="fill:#353535"/>
+</svg>

templates/base.html

@@ -90,6 +90,10 @@
                     <img src="/static/img/icons-numix/changes-secure-symbolic.svg" alt="">
                     <span>Privacy Policy</span>
                 </a>
+                <a href="/coc" class="icon-button">
+                    <img src="/static/img/icons-numix/system-users-symbolic.svg" alt="">
+                    <span>Code of Conduct</span>
+                </a>
             </div>
             <div class="copyright">
                 &copy; 2021 postmarketOS.org contributors