Add Flattr to our website

[KadeMorton]

I confirm:

• [x] I've read the contributing guidelines and the code of conduct
• [x] I've checked that this issue applies to this repo
• [x] I've checked the existing issues, no one else has reported this
• [x] I've got a clear and descriptive title for the issue

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Suggest an enhancement - delete this section if not suggesting an enhancement

To make your enhancement suggestion as useful to others as possible, please consider the below and try to answer as many of them as possible:

• Provide a step-by-step description of the suggested enhancement in as many details as possible.
• Provide specific examples to demonstrate the steps. Include copy/pasteable snippets which you use in those examples, as Markdown code blocks if possible.
• Describe the current behaviour and explain which behaviour you expected to see instead and why.
• Include screenshots which help you demonstrate the steps or point out the part of Aletheia which the suggestion is related to.
• Explain why this enhancement would be useful to most Aletheia users.
• List some other applications where this enhancement exists.
• Specify which version of Aletheia you're using.
• Specify the name and version of the OS you're using.

My response:

• I'm in the process of creating a Flattr account for Aletheia and we will need to add things to the website to make it Flattrable (I will update once I know what those things are...) Update: A tag needs to be added to the site that I can send to you
• Would be nice if it could go here
• It's not there currently
• N/A
• N/A
• N/A

[KadeMorton]

So, on having a look there is no Flattr icon on Font Awesome. I've written to Flattr, pointed them to the GitHub issue where people have asked to create one. Will update with a Flattr icon it they ever make one.