Random small cleanups (#9423)

* clean up toml files

* update the parity ethereum toolchain docs

* update contribution guide and issue templates

* update desktop and service files

* build clib examples with 8 threads

* update header templates

* replace parity technologies with parity ethereum logo

.github/ISSUE_TEMPLATE.md

@@ -1,13 +1,11 @@
 _Before filing a new issue, please **provide the following information**._
 
-> I'm running:
->
-> - **Which Parity version?**: 0.0.0
-> - **Which operating system?**: Windows / MacOS / Linux
-> - **How installed?**: via installer / homebrew / binaries / from source
-> - **Are you fully synchronized?**: no / yes
-> - **Which network are you connected to?**: ethereum / ropsten / kovan / ...
-> - **Did you try to restart the node?**: no / yes
+- **Parity Ethereum version**: 0.0.0
+- **Operating system**: Windows / MacOS / Linux
+- **Installation**: homebrew / one-line installer / built from source
+- **Fully synchronized**: no / yes
+- **Network**: ethereum / ropsten / kovan / ...
+- **Restarted**: no / yes
 
 _Your issue description goes here below. Try to include **actual** vs. **expected behavior** and **steps to reproduce** the issue._