Add note about renaming to docs

It's way easier to add a note to the guides than to redo all the images,
etc. We have more important things to spend our time on, but if someone
wants to redo them, you are very welcome!

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

Author: SISheogorath

docs/guides/auth/github.md

@@ -1,6 +1,8 @@
 Authentication guide - GitHub
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 1. Sign-in or sign-up for a GitHub account
 2. Navigate to developer settings in your GitHub account [here](https://github.com/settings/developers) and select the "OAuth Apps" tab
 3. Click on the **New OAuth App** button, to create a new OAuth App:

docs/guides/auth/gitlab-self-hosted.md

@@ -1,6 +1,8 @@
 # GitLab (self-hosted)
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 1. Sign in to your GitLab
 2. Navigate to the application management page at `https://your.gitlab.domain/admin/applications` (admin permissions required)
 3. Click **New application** to create a new application and fill out the registration form:

docs/guides/auth/saml-onelogin.md

@@ -1,6 +1,8 @@
 Authentication guide - SAML (OneLogin)
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 1. Sign-in or sign-up for an OneLogin account. (available free trial for 2 weeks)
 2. Go to the administration page.
 3. Select the **APPS** menu and click on the **Add Apps**.

docs/guides/auth/saml.md

@@ -1,6 +1,8 @@
 Authentication guide - SAML
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 The basic procedure is the same as the case of OneLogin which is mentioned in [OneLogin-Guide](./saml-onelogin.md). If you want to match your IdP, you can use more configurations as below.
 
 * If your IdP accepts metadata XML of the service provider to ease configuraion, use this url to download metadata XML.

docs/guides/auth/twitter.md

@@ -1,6 +1,8 @@
 Authentication guide - Twitter
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 1. Sign-in or sign-up for a Twitter account
 2. Go to the Twitter Application management page [here](https://apps.twitter.com/)
 3. Click on the **Create New App** button to create a new Twitter app:

docs/guides/minio-image-upload.md

@@ -1,6 +1,8 @@
-Minio Guide for HackMD
+Minio Guide for CodiMD
 ===
 
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
+
 1. First of all you need to setup Minio itself.
 
    Please refer to the [official Minio docs](https://docs.minio.io/) for an

docs/guides/s3-image-upload.md

@@ -1,4 +1,6 @@
-# Guide - Setup HackMD S3 image upload
+# Guide - Setup CodiMD S3 image upload
+
+***Note:** This guide was written before the renaming. Just replace `HackMD` with `CodiMD` in your mind :smile: thanks!*
 
 1. Go to [AWS S3 console](https://console.aws.amazon.com/s3/home) and create a new bucket.