fix html template for SMTP

[Issif]

Signed-off-by: Issif issif_github@gadz.org

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area build

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What this PR does / why we need it:

Since we changed the type for Priority field in Falcopayload struct from string to PriorityType (

falcosidekick/types/types.go

Line 14 in 3452a89

Priority PriorityType `json:"priority"`

), the html template for SMTP output is broken.

2021/02/16 23:11:48 [ERROR] : SMTP - template: html:11:6: executing "html" at <eq .Priority "debug">: error calling eq: incompatible types for comparison

Moreover, with the new design of falco.org, the logo image that was used as email header is not more there. I switched for a logo hosted by CNCF.

Which issue(s) this PR fixes:

#190

Fixes #

Special notes for your reviewer:

[cpanato]

/lgtm

thanks!

[poiana]

LGTM label has been added.

Git tree hash: 924c14d083941b258e6387de973c4c4bddf67f67

[poiana]

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This pull-request has been approved by: cpanato

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