Create release notes section of docs

[Ed McDonagh]

No description provided.

[Ed McDonagh]

Initial attempt at structure, not sure if '.' in filename will work. Refs #66.

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[Ed McDonagh]

Successful docs refresh after creating skeleton for release notes. Refs #66.

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[Ed McDonagh]

New docs refresh after creating skeleton for release notes. Refs #66.

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[Ed McDonagh]

Added links to issues in changes file. Refs #66.

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[Ed McDonagh]

Edited titles on releasenotes doc. Refs #66

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[Ed McDonagh]

Release notes section of docs created. Fixes #66.

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[Ed McDonagh]

Added headline changes to release notes. Refs #66.

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[Ed McDonagh]

Starting to actually put the specific upgrade instructions in. Refs #66.

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[Ed McDonagh]

Fixed bullet point formatting error. Refs #66.

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[Ed McDonagh]

Changed the numbers to bullet points as it seems rtd can't nest one within the other. Right-shifted the content to come within the bullet point structure. Refs #66.

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[Ed McDonagh]

Added windows path to schemamigration example and to the settings file example. Refs #66.

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[Ed McDonagh]

Altered and moved the migration warning, fixed the bullet point formatting for settings locations and added instruction for generating secret keys. Refs #66 and fixes #72. Instructions for secret key in install page already committed.

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[Ed McDonagh]

Added instruction to restart webserver to release upgrade instructions. Refs #66.

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