docs: Update overview diagram

The 3rd core is not used for BLE as of now so we should not document it
as such.  This commit also updates the colors of Epicardium and
Pycardium to match the rest of the docs & GitLab.

Signed-off-by: Rahix <rahix@rahix.de>

Documentation/static/overview.svg

@@ -10,9 +10,9 @@
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-   width="193.0201mm"
-   height="112.18587mm"
-   viewBox="0 0 193.0201 112.18587"
+   width="177.69194mm"
+   height="85.845795mm"
+   viewBox="0 0 177.69194 85.845797"
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    id="svg1036"
    sodipodi:docname="overview.svg"
@@ -148,21 +148,42 @@
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      inkscape:pageshadow="2"
      inkscape:zoom="1.4"
-     inkscape:cx="254.67554"
-     inkscape:cy="190.35742"
+     inkscape:cx="311.42364"
+     inkscape:cy="97.652686"
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+     inkscape:current-layer="a4682"
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      inkscape:pagecheckerboard="true"
      inkscape:window-width="1920"
      inkscape:window-height="1020"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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-     fit-margin-top="0"
-     fit-margin-left="0"
-     fit-margin-right="0"
-     fit-margin-bottom="0" />
+     fit-margin-top="5"
+     fit-margin-left="5"
+     fit-margin-right="5"
+     fit-margin-bottom="5">
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+       orientation="0,671.59159"
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   <metadata
      id="metadata1033">
     <rdf:RDF>
@@ -171,7 +192,7 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title />
+        <dc:title></dc:title>
       </cc:Work>
     </rdf:RDF>
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@@ -180,16 +201,16 @@
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@@ -301,19 +322,19 @@
              xlink:title="Epicardium">
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                xml:space="preserve"
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                  id="tspan6793">Epicardium</tspan><tspan
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                  x="40.307911"
                  y="119.77302"
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@@ -393,7 +414,7 @@
              xlink:title="Pycardium">
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                xml:space="preserve"
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@@ -401,11 +422,11 @@
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+                 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:6.3499999px;font-family:monospace;-inkscape-font-specification:monospace;fill:#428bca;fill-opacity:1;stroke-width:0.26458332;">Pycardium</tspan><tspan
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                  x="147.18329"
                  y="119.74747"
-                 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.58611107px;font-family:monospace;-inkscape-font-specification:monospace;fill:#0000ee;fill-opacity:1;stroke-width:0.26458332"
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@@ -421,41 +442,6 @@
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